Fixed another case of a warning reported by gcc 10.2.0.

cosinekitty · cosinekitty · commit 69251742c666 · 2020-10-03T13:59:23.000-04:00
diff --git a/chenclient/main.cpp b/chenclient/main.cpp
@@ -4,7 +4,11 @@
     https://github.com/cosinekitty/chenard/wiki/ChenServer
 */
 
-#define CHENARD_LINUX   (defined(__linux__) || defined(__APPLE__))    
+#if defined(__linux__) || defined(__APPLE__)
+#  define CHENARD_LINUX 1
+#else
+#  define CHENARD_LINUX 0
+#endif
 
 #include <stdlib.h>
 #include <string>
