Update toolchain (also fuck sourceforge)

MinGW-w64 has switched to Git quite a while ago, but sf.net never
purged the old SVN repos, so I have been building outdated versions
the entire time. That’s just awful.
Add command to apply Debian patches
Fix patch step order with force_rebuild_*
LAME: switch to patched Debian package repo

Fixes 32-bit build.
Don’t forget to revert patches made to SVN repos
Merge remote-tracking branch 'upstream/master'