fix build on MSVC

Author: cebtenzzre

ggml.c

@@ -1,5 +1,6 @@
 #define _GNU_SOURCE // Defines CLOCK_MONOTONIC on Linux
 #define _CRT_SECURE_NO_DEPRECATE // Disables ridiculous "unsafe" warnigns on Windows
+#define _USE_MATH_DEFINES // For M_PI on MSVC
 
 #include "ggml.h"
 
@@ -12093,8 +12094,10 @@ static void ggml_compute_forward_clamp(
 
 // ggml_compute_forward_rope
 
+#ifndef _MSC_VER
 // use -ffast-math so MIN and MAX are optimized to vminss and vmaxss
 __attribute__((optimize("-ffast-math"), always_inline))
+#endif
 static inline float ggml_rope_ntkv2_ramp(const float low, const float high, const int i0) {
     const float y = (i0 / 2 - low) / MIN(0.001f, high - low);
     return 1 - MIN(1, MAX(0, y));