Fix references to deleted avcodec_encode_video() function

configure

@@ -3893,7 +3893,7 @@ 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,sws_scale ||
     disable xmm_clobber_test

libavcodec/mpegvideo.h

@@ -295,7 +295,7 @@ typedef struct MpegEncContext {
     /* WARNING: changes above this line require updates to hardcoded
      *          offsets used in asm. */
 
-    int64_t user_specified_pts;///< last non zero pts from AVFrame which was passed into avcodec_encode_video()
+    int64_t user_specified_pts; ///< last non-zero pts from AVFrame which was passed into avcodec_encode_video2()
     /**
      * pts difference between the first and second input frame, used for
      * calculating dts of the first frame when there's a delay */