Fix previous MinGW fix.

Definitions required for MinGW need to be outside #if _MSC_VER. Oops.

src/include/port/win32_port.h

@@ -510,6 +510,11 @@ typedef unsigned short mode_t;
 #define isnan(x) _isnan(x)
 #endif
 
+/* Pulled from Makefile.port in MinGW */
+#define DLSUFFIX ".dll"
+
+#endif							/* _MSC_VER */
+
 #if (defined(_MSC_VER) && (_MSC_VER < 1900)) || \
 	defined(__MINGW32__) || defined(__MINGW64__)
 /*
@@ -529,9 +534,4 @@ typedef unsigned short mode_t;
 #define HAVE_BUGGY_STRTOF 1
 #endif
 
-/* Pulled from Makefile.port in MinGW */
-#define DLSUFFIX ".dll"
-
-#endif							/* _MSC_VER */
-
 #endif							/* PG_WIN32_PORT_H */