Replace calls to the deprecated function av_init_random() with
corresponding calls to av_random_init().

Originally committed as revision 16682 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c
index a22baac..01b8a70 100644
--- a/libavcodec/mpc7.c
+++ b/libavcodec/mpc7.c
@@ -53,7 +53,7 @@
         return -1;
     }
     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
-    av_init_random(0xDEADBEEF, &c->rnd);
+    av_random_init(&c->rnd, 0xDEADBEEF);
     dsputil_init(&c->dsp, avctx);
     c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4);
     ff_mpc_init();