Cisco optimization for x86 & fixed point

1. Only for fixed point on x86 platform (32bit and 64bit, uses SIMD
   intrinsics up to SSE4.2)
2. Use "configure --enable-fixed-point --enable-intrinsics" to enable
   optimization, default is disabled.
3. Official test cases are verified and passed.

Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>
diff --git a/celt/vq.h b/celt/vq.h
index 84115cb..f895820 100644
--- a/celt/vq.h
+++ b/celt/vq.h
@@ -63,8 +63,8 @@
 unsigned alg_unquant(celt_norm *X, int N, int K, int spread, int B,
       ec_dec *dec, opus_val16 gain);
 
-void renormalise_vector(celt_norm *X, int N, opus_val16 gain);
+void renormalise_vector(celt_norm *X, int N, opus_val16 gain, int arch);
 
-int stereo_itheta(const celt_norm *X, const celt_norm *Y, int stereo, int N);
+int stereo_itheta(const celt_norm *X, const celt_norm *Y, int stereo, int N, int arch);
 
 #endif /* VQ_H */