headers: Don't have a define expand to something containing defined()

The behaviour of a macro expanding to something containing defined()
is undefined.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-headers/include/winbase.h

diff --git a/mingw-w64-headers/include/winbase.h b/mingw-w64-headers/include/winbase.h
index 8abb610..17025b3 100644
--- a/mingw-w64-headers/include/winbase.h
+++ b/mingw-w64-headers/include/winbase.h
@@ -3053,7 +3053,11 @@
 #define MICROSOFT_WINDOWS_WINBASE_INTERLOCKED_CPLUSPLUS_H_INCLUDED
 #if !defined (__WIDL__) && defined (__cplusplus)
 #if !defined (MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS)
-#define MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS (_WIN32_WINNT >= 0x0502 || !defined (_WINBASE_))
+#if (_WIN32_WINNT >= 0x0502 || !defined (_WINBASE_))
+#define MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS 1
+#else
+#define MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS 0
+#endif
 #endif
 #if MICROSOFT_WINDOWS_WINBASE_H_DEFINE_INTERLOCKED_CPLUSPLUS_OVERLOADS
 extern "C++" {