define MAXPATHLEN for hosts that don't support it

[jc: Martin says syllable (www.syllable.org) wants this.]

Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/git-compat-util.h b/git-compat-util.h
index 4185b12..ead0ede 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -110,4 +110,7 @@
 	return x;
 }
 
+#ifndef MAXPATHLEN
+#define MAXPATHLEN 256
+#endif
 #endif