Disable reading RDTSC. It breaks the build on non-intel architectures and
is only used for debug output that isn't compiled in anyway.

Index: src/rsp.h
--- src/rsp.h.orig
+++ src/rsp.h
@@ -380,7 +380,6 @@ INLINE void n64_dp_reg_w(UINT32 offset, UINT32 data, U
     }
 }
 
-#define INTEL86
 #if defined(INTEL86) && defined __GNUC__ && __GNUC__ >= 2
 static __inline__ unsigned long long RDTSC(void)
 {
