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

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