configure: Remove reference to no longer existing avcodec_encode_video()

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

configure

@@ -5580,7 +5580,6 @@ enabled xmm_clobber_test &&
                   -Wl,--wrap,avcodec_decode_video2      \
                   -Wl,--wrap,avcodec_decode_subtitle2   \
                   -Wl,--wrap,avcodec_encode_audio2      \
-                  -Wl,--wrap,avcodec_encode_video       \
                   -Wl,--wrap,avcodec_encode_video2      \
                   -Wl,--wrap,avcodec_encode_subtitle    \
                   -Wl,--wrap,swr_convert                \