vaapi: wrap codec specific functions in appropiate #ifs

Fix linking when only a subset of vaapi decoders is enabled.

Bug-Id: 760
CC: libav-stable@libav.org
Signed-off-by: NRémi Denis-Courmont <remi@remlab.net>
Signed-off-by: NLuca Barbato <lu_zero@gentoo.org>

libavcodec/vaapi.c

@@ -194,6 +194,9 @@ void ff_vaapi_common_end_frame(AVCodecContext *avctx)
     vactx->slice_params_alloc  = 0;
 }
 
+#if CONFIG_H263_VAAPI_HWACCEL  || CONFIG_MPEG1_VAAPI_HWACCEL || \
+    CONFIG_MPEG2_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL || \
+    CONFIG_VC1_VAAPI_HWACCEL   || CONFIG_WMV3_VAAPI_HWACCEL
 int ff_vaapi_mpeg_end_frame(AVCodecContext *avctx)
 {
     struct vaapi_context * const vactx = avctx->hwaccel_context;
@@ -215,5 +218,6 @@ finish:
     ff_vaapi_common_end_frame(avctx);
     return ret;
 }
+#endif
 
 /* @} */