winstorecompat: Add a cast to silence a warning about conversion between void pointer and function pointer

Signed-off-by: Martin Storsjö <martin@martin.st>
diff --git a/mingw-w64-libraries/winstorecompat/src/SetUnhandledExceptionFilter.c b/mingw-w64-libraries/winstorecompat/src/SetUnhandledExceptionFilter.c
index b80b785..5cfe1d8 100644
--- a/mingw-w64-libraries/winstorecompat/src/SetUnhandledExceptionFilter.c
+++ b/mingw-w64-libraries/winstorecompat/src/SetUnhandledExceptionFilter.c
@@ -36,7 +36,7 @@
         LPTOP_LEVEL_EXCEPTION_FILTER prev_filter;
     } u;
     PVOID *target = &u.target;
-    return (LPTOP_LEVEL_EXCEPTION_FILTER)(INT_PTR)InterlockedExchangePointer(target, lpTopLevelExceptionFilter);
+    return (LPTOP_LEVEL_EXCEPTION_FILTER)(INT_PTR)InterlockedExchangePointer(target, (PVOID)lpTopLevelExceptionFilter);
 }
 
 #ifdef _X86_