[packages/gcc] (2 commits) Non-fast-forward update to branch GCC_12

[qboosh]

The branch 'GCC_12' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch.

Commits removed from the branch:

  acbd4ea... - build gdc (-d and libphobos* packages); in gcc 12+ it req

Commits added to the branch:

  f7acd18... - build gdc (-d and libphobos* packages); in gcc 12+ it req
  6466635... - updated to 12.4.0