File mingw-gen-dll-fix.patch of Package mingw64-mysql-connector-c

diff -ur mysql-connector-c-6.1.11-src.orig/include/my_global.h mysql-connector-c-6.1.11-src/include/my_global.h
--- mysql-connector-c-6.1.11-src.orig/include/my_global.h	2017-07-13 08:55:32.000000000 +0200
+++ mysql-connector-c-6.1.11-src/include/my_global.h	2024-08-10 00:45:32.461482966 +0200
@@ -459,7 +459,7 @@
 
 #define NullS		(char *) 0
 
-#ifdef _WIN32
+#if defined(_WIN32) && !defined(__MINGW32__)
 #define STDCALL __stdcall
 #else
 #define STDCALL