Work around compilation errors with MinGW and --enable-debug

sal/osl/w32/module.cxx

@@ -26,13 +26,7 @@
 *
 ************************************************************************/
 
-#ifdef __MINGW32__
-extern "C" {
-#endif
 #include "system.h"
-#ifdef __MINGW32__
-}
-#endif
 #include <tlhelp32.h>
 
 #include "file_url.h"

sal/osl/w32/system.h

@@ -64,10 +64,14 @@
     // at the same time without patching
     // windows.h
     #include <windows.h>
-#ifdef __MINGW32__
     #include <winsock2.h>
+    #ifdef __cplusplus
+    extern "C" {
+    #endif
     #include <ws2tcpip.h>
-#endif
+    #ifdef __cplusplus
+    }
+    #endif
     #include <shlobj.h>
     #ifndef NO_DEBUG_CRT
         #include <crtdbg.h>