fix ffmpeg build problem

First show the error message and root cause:

error: can't find a register in class 'GENERAL_REGS' while reloading 'asm'

error: unknown register name ‘%xmm0’ in ‘asm’

affetcted files

libavcodec/x86/mpegvideo_mmx.c

libavcodec/x86/mpegvideo_mmx_template.c

Just cut the bottom half source into another source file and compile it .

I think , it is a gcc bug.

2.  undefiend symbols

when use libavcodec, it report that these symbols can't be found in static library.

00000000 T ff_float_interleave_c
         U ff_float_interleave2_mmx
         U ff_float_interleave2_sse
         U ff_float_interleave6_mmx
         U ff_float_interleave6_sse
         U ff_float_interleave_c
         U ff_float_to_int16_3dnow
         U ff_float_to_int16_interleave2_3dnow
         U ff_float_to_int16_interleave2_sse
         U ff_float_to_int16_interleave2_sse2
         U ff_float_to_int16_interleave6_3dn2
         U ff_float_to_int16_interleave6_3dnow
         U ff_float_to_int16_interleave6_sse
         U ff_float_to_int16_sse
         U ff_float_to_int16_sse2

This is occus when assebly files are not compiled into libavcodec.

最后

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