build linux 64-bit binaries with PIC
Merge pull request #29 from ToadKing/master

build linux 64-bit binaries with PIC
Add MIPS32 ffmpeg for Linux.
Merge pull request #30 from xsacha/master

Add MIPS32 ffmpeg for Linux.
MIPS: Disable some features for gcw-zero build and left options for cross-compiling commented.
Merge https://github.com/hrydgard/ppsspp-ffmpeg

Conflicts:
	linux/x86_64/lib/libavcodec.a
	linux/x86_64/lib/libavformat.a
	linux/x86_64/lib/libavutil.a
	linux/x86_64/lib/libswresample.a
	linux/x86_64/lib/libswscale.a