mingw64: include sal/types.h to be sure we are using C99 formatting strings

Change-Id: Idb78cb18ed7718996628233dfb546eb1f6f345c1

svx/source/gengal/gengal.cxx

@@ -7,6 +7,12 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
+
+// Include this before stdio.h for the __MINGW32__ sake.
+// This header contails a define that modifies the way
+// formating strings work for the mingw platforms.
+#include <sal/types.h>
+
 #include <stdio.h>
 #ifndef _WIN32
 #include <unistd.h>