lavc: move the vaapi encoders further down in the list of codecs

Right now they are the first encoders for those codecs in the list, so
they are selected when the caller requests a codec by id.
Since they require special treatment, they should not be selected by
default if there are other encoders (e.g. libx264/5) available.

libavcodec/allcodecs.c

@@ -166,11 +166,9 @@ void avcodec_register_all(void)
     REGISTER_DECODER(H264,              h264);
     REGISTER_DECODER(H264_MMAL,         h264_mmal);
     REGISTER_DECODER(H264_QSV,          h264_qsv);
-    REGISTER_ENCODER(H264_VAAPI,        h264_vaapi);
     REGISTER_ENCDEC (HAP,               hap);
     REGISTER_DECODER(HEVC,              hevc);
     REGISTER_DECODER(HEVC_QSV,          hevc_qsv);
-    REGISTER_ENCODER(HEVC_VAAPI,        hevc_vaapi);
     REGISTER_DECODER(HNM4_VIDEO,        hnm4_video);
     REGISTER_DECODER(HQ_HQA,            hq_hqa);
     REGISTER_DECODER(HQX,               hqx);
@@ -195,7 +193,6 @@ void avcodec_register_all(void)
     REGISTER_DECODER(MIMIC,             mimic);
     REGISTER_ENCDEC (MJPEG,             mjpeg);
     REGISTER_DECODER(MJPEGB,            mjpegb);
-    REGISTER_ENCODER(MJPEG_VAAPI,       mjpeg_vaapi);
     REGISTER_DECODER(MMVIDEO,           mmvideo);
     REGISTER_DECODER(MOTIONPIXELS,      motionpixels);
 #if FF_API_XVMC
@@ -489,9 +486,12 @@ void avcodec_register_all(void)
     REGISTER_ENCODER(H264_NVENC,        h264_nvenc);
     REGISTER_ENCODER(H264_OMX,          h264_omx);
     REGISTER_ENCODER(H264_QSV,          h264_qsv);
+    REGISTER_ENCODER(H264_VAAPI,        h264_vaapi);
     REGISTER_ENCODER(LIBKVAZAAR,        libkvazaar);
     REGISTER_ENCODER(HEVC_NVENC,        hevc_nvenc);
     REGISTER_ENCODER(HEVC_QSV,          hevc_qsv);
+    REGISTER_ENCODER(HEVC_VAAPI,        hevc_vaapi);
+    REGISTER_ENCODER(MJPEG_VAAPI,       mjpeg_vaapi);
     REGISTER_ENCODER(MPEG2_QSV,         mpeg2_qsv);
     REGISTER_ENCODER(MPEG4_OMX,         mpeg4_omx);
 #if FF_API_NVENC_OLD_NAME