lavc: deprecate VIMA decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/allcodecs.c

@@ -477,7 +477,9 @@ void avcodec_register_all(void)
     REGISTER_DECODER(ADPCM_VIMA,        adpcm_vima);
     REGISTER_DECODER(ADPCM_XA,          adpcm_xa);
     REGISTER_ENCDEC (ADPCM_YAMAHA,      adpcm_yamaha);
+#if FF_API_VIMA_DECODER
     REGISTER_DECODER(VIMA,              vima);
+#endif
 
     /* subtitles */
     REGISTER_ENCDEC (SSA,               ssa);