Revert "Merge commit 'b08caa87c3'"

This reverts commit d8bbb99c51, reversing
changes made to d0d0913702.

Signed-off-by: Philip Langdale <philipl@overt.org>

libavcodec/allcodecs.c

@@ -563,9 +563,7 @@ void avcodec_register_all(void)
     /* external libraries, that shouldn't be used by default if one of the
      * above is available */
     REGISTER_ENCODER(LIBOPENH264,       libopenh264);
-    REGISTER_ENCODER(H264_NVENC,        h264_nvenc);
     REGISTER_ENCODER(H264_QSV,          h264_qsv);
-    REGISTER_ENCODER(HEVC_NVENC,        hevc_nvenc);
 
     /* parsers */
     REGISTER_PARSER(AAC,                aac);