Update gcc_build.

 - Build shared gcc_libs and relocate DLLs.
 - Improve NLS.
 - Change shared library name of zlib.
 - Change FLAGS to reduce toolchain size.
Update bat/dotfiles/etc.
buildscripts: Add arch option.
buildscripts: Cleanup.
buildscripts/ffmpeg.sh: Add libvorbis.
buildscripts: Build shared libraries only.