avcodec/options_table: disable CRC checking by default

3 runs each of fate-suite/hevc-conformance/ENTP_C_LG_3.bit

with crc flag
1841819858 decicycles in frame decode, 32 runs, 0 skips
1833937180 decicycles in frame decode, 32 runs, 0 skips
1843283884 decicycles in frame decode, 32 runs, 0 skips

without crc flag
1703897301 decicycles in frame decode, 32 runs, 0 skips
1695031879 decicycles in frame decode, 32 runs, 0 skips
1697524383 decicycles in frame decode, 32 runs, 0 skips

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
