msvc: disable meaningless constant truncation warnings in SDCardUtil

Source/Core/Common/SDCardUtil.cpp

@@ -49,6 +49,11 @@
 #include <unistd.h>  // for unlink()
 #endif
 
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4310)
+#endif
+
 /* Believe me, you *don't* want to change these constants !! */
 #define BYTES_PER_SECTOR 512
 #define RESERVED_SECTORS 32
@@ -289,3 +294,7 @@ FailWrite:
     ERROR_LOG(COMMON, "unlink(%s) failed: %s", filename.c_str(), GetLastErrorMsg().c_str());
   return false;
 }
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif