Merge pull request #1857 from MerryMage/rotr-rotl

common_funcs: Provide rotr and rotl for MSVC

src/common/common_funcs.h

@@ -72,6 +72,7 @@ inline u64 _rotr64(u64 x, unsigned int shift){
 }
 
 #else // _MSC_VER
+
 #if (_MSC_VER < 1900)
     // Function Cross-Compatibility
     #define snprintf _snprintf
@@ -84,6 +85,11 @@ inline u64 _rotr64(u64 x, unsigned int shift){
     __declspec(dllimport) void __stdcall DebugBreak(void);
 }
 #define Crash() {DebugBreak();}
+
+// cstdlib provides these on MSVC
+#define rotr _rotr
+#define rotl _rotl
+
 #endif // _MSC_VER ndef
 
 // Generic function to get last error message.