fixed compilation warning about const (depends on speex lib ver)

git-svn-id: http://svn.berlios.de/svnroot/repos/sems/trunk@597 8eb893ce-cfd4-0310-b710-fb5ebe64c474

core/plug-in/speex/speex.c

@@ -282,7 +282,7 @@ int Pcm16_2_SpeexNB( unsigned char* out_buf, unsigned char* in_buf, unsigned int
 {
   SpeexState* ss;
   OneWay *encoder;
-  const short* pcm = (const short*) in_buf;
+  short* pcm = (short*) in_buf;
   char* buffer = (char*)out_buf;
   div_t blocks;