defaults: if no crashhandler was defined, fallback to null

common/defaults.h

@@ -118,8 +118,6 @@ SETUP BACKENDS DEFINITIONS
 		#define XASH_CRASHHANDLER CRASHHANDLER_DBGHELP
 	#elif XASH_LINUX || XASH_BSD
 		#define XASH_CRASHHANDLER CRASHHANDLER_UCONTEXT
-	#else // !(XASH_LINUX || XASH_BSD || XASH_WIN32)
-		#define XASH_CRASHHANDLER CRASHHANDLER_NULL
 	#endif // !(XASH_LINUX || XASH_BSD || XASH_WIN32)
 #endif
 
@@ -159,6 +157,10 @@ SETUP BACKENDS DEFINITIONS
 	#define XASH_INPUT INPUT_NULL
 #endif // XASH_INPUT
 
+#ifndef XASH_CRASHHANDLER
+	#define XASH_CRASHHANDLER CRASHHANDLER_NULL
+#endif // XASH_CRASHHANDLER
+
 /*
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