[arch-dev-public] Merging multilib toolchain with [core]

[Bartłomiej Piotrowski]

Hi,

For a long time we have been maintaining multilib-enabled gcc package
separately under [multilib] repo. Compilation takes a lot and usually it
falls behind because I forget to keep it in sync with [core].

I propose to merge it with core/gcc instead and split lib32-gcc-libs.
The latter would be moved to [core] due to dbscripts inability to
maintain split packages in multiple repositories. On the same note, the
same would happen to lib32-glibc.

Any objections?
Bartłomiej