altivec workaround

Originally committed as revision 3259 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/wmadec.c

@@ -702,7 +702,12 @@ static int wma_decode_block(WMADecodeContext *s)
     int n, v, a, ch, code, bsize;
     int coef_nb_bits, total_gain, parse_exponents;
     float window[BLOCK_MAX_SIZE * 2];
+// XXX: FIXME!! there's a bug somewhere which makes this mandatory under altivec
+#ifdef HAVE_ALTIVEC
+    volatile int nb_coefs[MAX_CHANNELS] __attribute__((aligned(16)));
+#else
     int nb_coefs[MAX_CHANNELS];
+#endif
     float mdct_norm;
 
 #ifdef TRACE