cross/gcc-*: upgrade to 14.2.0-r4 (MR 5722)

Quite a messy upgrade due to changes in both abuild and in the upstream
gcc APKBUILD breaking various things. Pmbootstrap also seems to
misbehave in GitLab CI making it difficult to validate.

Manual fixups:
* Set !tracedeps - changed behavior in abuild
* Manually add "so:" dependencies to avoid issues with !tracedeps set
  (becomes obvious with crossdirect)
* Add back makedepends="$makedepends_build $makedepends_host"
* Disable move of some files into usr/lib to avoid
  ERROR: gcc-aarch64-14.2.0-r4: trying to overwrite usr/lib/libgcc_s.so.1 owned by libgcc-14.2.0-r4.

[ci:skip-build] # pmbootstrap bugs will prohibit this from building
                # anyways, don't even attempt

Co-developed-by: Luca Weiss <luca@lucaweiss.eu>