993aa41 scripted-diff: gitian: Use REFERENCE_DATETIME directly. (Carl Dong)

Pull request description:

  Fixes regression introduced by #16141.

  ```
  -BEGIN VERIFY SCRIPT-
  sed -i 's#\$REFERENCE_DATE\\\\\\ \$REFERENCE_TIME#\$REFERENCE_DATETIME#g' contrib/gitian-descriptors/*
  -END VERIFY SCRIPT-
  ```

  -----

  Note that this could have been fixed by escaping properly, but using `REFERENCE_DATETIME` directly is simpler.

  Future note: `REFERENCE_{DATE{,DATETIME},TIME}` is a bit ridiculous. At the very _least_ gitian should use epoch, as it is the most parse-able, and preferably set SOURCE_DATE_EPOCH.

ACKs for commit 993aa4:

Tree-SHA512: 8457e5fffde66e1d2b846547b6807416b884c171f63569f76dfefd498d2a58ad6f9eb93931eb6cfc7ff38c6b460b0c488ca87d1a68bc630c48f365a74b6ee163

…ptors

Summary:
bc8863b81922eb878519f328e9b0c7974aaa34ff depends: remove usage of TAR_OPTIONS (fanquake)
3ff1f2a319fc619954736d1e540ccbebc818ff11 build: remove export GZIP from gitian descriptors (fanquake)

Pull request description:

  The `GZIP` environment variable is [deprecated](https://www.gnu.org/software/gzip/manual/gzip.html#Environment), and everywhere that we invoke `gzip` we are already passing `-9n` directly, i.e:
  ```base
    find bitcoin-* | sort | tar --no-recursion --mode='u+rw,go+r-w,a+X' --owner=0 --group=0 -c -T - | gzip -9n > ../$SOURCEDIST
  ```

  ```bash
  GZIP="-9n" gzip -h
  gzip: warning: GZIP environment variable is deprecated; use an alias or script
  Usage: gzip [OPTION]... [FILE]...
  ```

Merge #16184: scripted-diff: gitian: Use REFERENCE_DATETIME directly.

Pull request description:

  Fixes regression introduced by #16141.

  ```
  -BEGIN VERIFY SCRIPT-
  sed -i 's#\$REFERENCE_DATE\\\\\\ \$REFERENCE_TIME#\${REFERENCE_DATETIME}#g' contrib/gitian-descriptors/*
  -END VERIFY SCRIPT-
  ```

  -----

  Note that this could have been fixed by escaping properly, but using `REFERENCE_DATETIME` directly is simpler.

  Future note: `REFERENCE_{DATE{,DATETIME},TIME}` is a bit ridiculous. At the very _least_ gitian should use epoch, as it is the most parse-able, and preferably set SOURCE_DATE_EPOCH.

Backport of Core [[bitcoin/bitcoin#16141 | PR16141]] and [[bitcoin/bitcoin#16184 | PR16184]] (to fix a regression in 16141)

Test Plan: Run all Gitian builds in CI

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8136

…scriptors

a7dbb27 build: add missing attributes to Win installer (Fuzzbawls)
13d0b48 nsis: Don't duplicate URL string (Fuzzbawls)
56563e5 build: remove WINDOWS_BITS from build system (fanquake)
0cb37c8 nsis: Write to correct filename in first place (Carl Dong)
7aa2823 gitian: Put things in the right place to begin with (Carl Dong)
0dcf6e6 gitian: Eliminate rename dependency (Carl Dong)
ba579b9 gitian: Smaller diff with gitian-linux.yml (Carl Dong)
3b9d5e8 gitian: Fix README inclusion in archives (Carl Dong)
07c27d2 gitian: Use split-debug.sh for Win builds (Carl Dong)
9f19095 build: Add README.md to DIST target (MarcoFalke)
ce80c76 build: remove mingw linker workaround from win gitian descriptor (fanquake)
37441b0 scripted-diff: gitian: Use REFERENCE_DATETIME directly. (Fuzzbawls)
966fe9a depends: remove usage of TAR_OPTIONS (fanquake)
12fd641 build: remove export GZIP from gitian descriptors (fanquake)

Pull request description:

  This is a collection of upstream PRs focused on cleaning up the gitian descriptors (un-needed or duplicate code bits, standardizing similar actions across the descriptors, etc), and minor cleanups to supporting build system files.

  Included are the following upstream PRs:
  * bitcoin#16141
  * bitcoin#16184
  * bitcoin#16667
  * bitcoin#17097
  * bitcoin#17029
  * bitcoin#17308
  * bitcoin#17756
  * bitcoin#18059

ACKs for top commit:
  furszy:
    Tested ACK a7dbb27
  random-zebra:
    ACK a7dbb27 and merging...

Tree-SHA512: 409d4f51adfb1c90aa8bc572fe6610596dea1293a8ca795f9071bb88bd583bd7678359ee19e34440bb0d117075ebd27f9a622247ee3dfd0cd9088e6da306a4d5

…rectly.

993aa41 scripted-diff: gitian: Use REFERENCE_DATETIME directly. (Carl Dong)

Pull request description:

  Fixes regression introduced by bitcoin#16141.

  ```
  -BEGIN VERIFY SCRIPT-
  sed -i 's#\$REFERENCE_DATE\\\\\\ \$REFERENCE_TIME#\$REFERENCE_DATETIME#g' contrib/gitian-descriptors/*
  -END VERIFY SCRIPT-
  ```

  -----

  Note that this could have been fixed by escaping properly, but using `REFERENCE_DATETIME` directly is simpler.

  Future note: `REFERENCE_{DATE{,DATETIME},TIME}` is a bit ridiculous. At the very _least_ gitian should use epoch, as it is the most parse-able, and preferably set SOURCE_DATE_EPOCH.

ACKs for commit 993aa4:

Tree-SHA512: 8457e5fffde66e1d2b846547b6807416b884c171f63569f76dfefd498d2a58ad6f9eb93931eb6cfc7ff38c6b460b0c488ca87d1a68bc630c48f365a74b6ee163

…rectly.

993aa41 scripted-diff: gitian: Use REFERENCE_DATETIME directly. (Carl Dong)

Pull request description:

  Fixes regression introduced by bitcoin#16141.

  ```
  -BEGIN VERIFY SCRIPT-
  sed -i 's#\$REFERENCE_DATE\\\\\\ \$REFERENCE_TIME#\$REFERENCE_DATETIME#g' contrib/gitian-descriptors/*
  -END VERIFY SCRIPT-
  ```

  -----

  Note that this could have been fixed by escaping properly, but using `REFERENCE_DATETIME` directly is simpler.

  Future note: `REFERENCE_{DATE{,DATETIME},TIME}` is a bit ridiculous. At the very _least_ gitian should use epoch, as it is the most parse-able, and preferably set SOURCE_DATE_EPOCH.

ACKs for commit 993aa4:

Tree-SHA512: 8457e5fffde66e1d2b846547b6807416b884c171f63569f76dfefd498d2a58ad6f9eb93931eb6cfc7ff38c6b460b0c488ca87d1a68bc630c48f365a74b6ee163

Merges: bitcoin#16184, bitcoin#17029, bitcoin#17308, bitcoin#17409, bitcoin#17483, bitcoin#17756, bitcoin#18331, bitcoin#18556, bitcoin#19622; partial merges: bitcoin#16327, bitcoin#18104, bitcoin#18741, bitcoin#20318, bitcoin#21036