package gcc: revert update from 4.7.2 to 4.8.0
Revert "mingw-w64 toolchain: update to trunk following gcc 4.8"

This reverts commit 74791f5ae85405a150141a8da8426bd9461c3ab1.
Revert "gtk2 dependencies: disable mingw-w64 builds"

This reverts commit 5a6eca8904e892d1fe599213d48759e25ed6615f.
Revert "package gtk2: disable mingw-w64 builds"

This reverts commit f4535d20215fa96cee1b857414b7c1769cd3f3a4.
Revert "package wxwidgets: disbale x86_64-w64 build"

This reverts commit 9fd3d675e6e87224b6bbd288ed5f90f216b23e93.
Revert "package plibc: disbale x86_64-w64 build"

This reverts commit d06a46e7cf419b1b637c8f95e1e4a315d49f0252.