Changed some MSVC compatibility defines based on MSVC version. (#724)

include/unicorn/platform.h

@@ -199,8 +199,10 @@ static void usleep(const int64_t &t)
 // misc support
 #if defined(_MSC_VER)
 #define va_copy(d,s) ((d) = (s))
-#define snprintf	_snprintf
 #define strcasecmp	_stricmp
+#if (_MSC_VER < MSC_VER_VS2015)
+#define snprintf	_snprintf
+#endif
 #if (_MSC_VER <= MSC_VER_VS2013)
 #define strtoll		_strtoi64
 #endif

qemu/include/qemu/compiler.h

@@ -4,6 +4,7 @@
 #define COMPILER_H
 
 #include "config-host.h"
+#include "unicorn/platform.h"
 
 #ifdef _MSC_VER
 // MSVC support
@@ -13,7 +14,10 @@
 
 #include <math.h>
 #include <float.h>
+
+#if _MSC_VER < MSC_VER_VS2013
 #define isinf(x) (!_finite(x))
+#endif
 
 static double rint( double x )
 {