Add back cxxstd=03 to .drone.jsonnet

Add back cxxstd=03 to .drone.jsonnet

Fix 3.19 version check

Fix 3.19 version check

Do not include <iosfwd> or declare operator<< when BOOST_NO_IOSTREAM …

…is defined. Fixes #43.

Do not include <iosfwd> or declare operator<< when BOOST_NO_IOSTREAM …

…is defined. Fixes #43.

Apply Node20 workaround

Update .drone.jsonnet

Update .drone.jsonnet

Require GCC 8 for __builtin_FILE for reproducible builds. Fixes #38.