Add some Bytef* casts. Found by IRIX 6.5 cc.

--HG--
branch : HEAD
diff --git a/lib/zip_fread.c b/lib/zip_fread.c
index 96f32c5..7ac8ebf 100644
--- a/lib/zip_fread.c
+++ b/lib/zip_fread.c
@@ -1,5 +1,5 @@
 /*
-  $NiH: zip_fread.c,v 1.13 2004/11/18 17:11:21 wiz Exp $
+  $NiH: zip_fread.c,v 1.14 2005/01/11 19:52:24 wiz Exp $
 
   zip_fread.c -- read from file
   Copyright (C) 1999, 2004 Dieter Baron and Thomas Klausner
@@ -107,7 +107,7 @@
 		}
 		else if (len < 0)
 		    return -1;
-		zf->zstr->next_in = zf->buffer;
+		zf->zstr->next_in = (Bytef *)zf->buffer;
 		zf->zstr->avail_in = len;
 		continue;
 	    }