Silence gcc warnings by making explicit the cast from 64 bits to 32 bits.

stepmania/src/RageSoundReader_MP3.cpp

@@ -271,7 +271,7 @@ struct madlib_t
 
 static float scale(mad_fixed_t sample)
 {
-	return (double) sample / (1<<MAD_F_FRACBITS);
+	return float( double(sample) / (1<<MAD_F_FRACBITS) );
 }
 
 static int get_this_frame_byte( const madlib_t *mad )

stepmania/src/RageSoundReader_Vorbisfile.cpp

@@ -273,7 +273,7 @@ int RageSoundReader_Vorbisfile::GetNextSourceFrame() const
 {
 	ASSERT(vf);
 
-	int iFrame = ov_pcm_tell( vf );
+	int iFrame = (int)ov_pcm_tell( vf );
 	return iFrame;
 }
 

stepmania/src/arch/MovieTexture/MovieTexture_FFMpeg.cpp

@@ -412,7 +412,7 @@ int MovieDecoder_FFMpeg::DecodePacket( float fTargetTime )
 		{
 			if (m_Packet.dts != int64_t(AV_NOPTS_VALUE))
 			{
-				m_fPTS = m_Packet.dts * av_q2d(m_pStream->time_base);
+				m_fPTS = float( m_Packet.dts * av_q2d(m_pStream->time_base) );
 
 				/* dts is the timestamp of the first frame in this packet. Only use it once;
 				 * if we get more than one frame from the same packet (eg. f;lushing the last