devkitARM: fix c89 building

remove stale patches

devkitA64: update newlib patch

update patchsets for devkitARM release 67.1

remove unused patches

devkitPPC: newlib-4.6.0.20260123-2

devkitPPC: add patches for r49

devkitPPC: move linkscripts to separate project

devkitARM: gcc 15.2.0

devkitA64: gcc 15.2.0