Define MAX_PATH for *nix since it's used all over.

Sources/Plasma/CoreLib/hsUtils.h

@@ -164,6 +164,8 @@ inline hsBool hsCompare(float a, float b, float delta=0.0001);
 #    define hsSnwprintf     swprintf
 
 #   define hsWFopen(name, mode)     fopen(hsWStringToString(name), hsWStringToString(mode))
+
+#   define MAX_PATH 1024
 #endif
 
 // Useful floating point utilities