Update to opus-HEAD-66611f1.

celt/_kiss_fft_guts.h

Index: celt/_kiss_fft_guts.h
diff --git a/celt/_kiss_fft_guts.h b/celt/_kiss_fft_guts.h
index aefe490e117d378b20eabfa5cceba1dd801682ec..5e3d58fd6641e53dfb56a2f32d58c8cd9717a47f 100644
--- a/celt/_kiss_fft_guts.h
+++ b/celt/_kiss_fft_guts.h
@@ -65,10 +65,6 @@
       do{ (m).r = ADD32(S_MUL((a).r,(b).r) , S_MUL((a).i,(b).i)); \
           (m).i = SUB32(S_MUL((a).i,(b).r) , S_MUL((a).r,(b).i)); }while(0)
 
-#   define C_MUL4(m,a,b) \
-      do{ (m).r = SHR32(SUB32(S_MUL((a).r,(b).r) , S_MUL((a).i,(b).i)),2); \
-          (m).i = SHR32(ADD32(S_MUL((a).r,(b).i) , S_MUL((a).i,(b).r)),2); }while(0)
-
 #   define C_MULBYSCALAR( c, s ) \
       do{ (c).r =  S_MUL( (c).r , s ) ;\
           (c).i =  S_MUL( (c).i , s ) ; }while(0)
@@ -101,6 +97,9 @@
 #if defined(OPUS_ARM_INLINE_EDSP)
 #include "arm/kiss_fft_armv5e.h"
 #endif
+#if defined(MIPSr1_ASM)
+#include "mips/kiss_fft_mipsr1.h"
+#endif
 
 #else  /* not FIXED_POINT*/