Update scripts.
 * Compile ffmpeg with all it's dependencies so Chrome can play H264 video.
 * Compile everything as shared if supported to reduce total size.
 * Don't use clang for compilation -- diminishing benefits over time.
 * Use prowl to notify about compilation status.
 * Make package name optional in do_compile and do_patch commands.
 * Don't create non-incremental archives when building everything to save space.
 * Add more hidden chrome dependencies.
 * Add llvm 2.9 to compile llvmpipe in Mesa, which is waaay faster than softpipe.
 * Add glxgears to test GL usability after compilation.