make fail - disable all encoder in ffmpeg

阿，上一篇把所有 encoder都disable 的話會fail...

c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0x4a57): undefined reference to `ff_epzs_motion_search'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0x4bba): undefined reference to `ff_get_mb_score'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0xf64d): undefined reference to `ff_rate_estimate_qscale'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0xfb74): undefined reference to `h263_encode_init'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0xfc0f): undefined reference to `ff_rate_control_init'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0x10894): undefined reference to `ff_rate_estimate_qscale'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0x10ce0): undefined reference to `ff_init_me'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0x1184d): undefined reference to `ff_rate_estimate_qscale'
c:/ffmpeg/build/libavcodec/libavcodec.a(snow.o):snow.c:(.text+0x11886): undefined reference to `ff_write_pass1_stats'
collect2: ld returned 1 exit status

所以重新打開好了...(雖然看起來好像開 h264 encoder就可以..)