Make WMAVoice decoder depend on DCT/RDFT

Originally committed as revision 22955 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1304,7 +1304,7 @@ wmav1_decoder_select="mdct"
 wmav1_encoder_select="mdct"
 wmav2_decoder_select="mdct"
 wmav2_encoder_select="mdct"
-wmavoice_decoder_select="lsp"
+wmavoice_decoder_select="lsp rdft dct"
 wmv1_decoder_select="h263_decoder"
 wmv1_encoder_select="h263_encoder"
 wmv2_decoder_select="h263_decoder"