zlib: fixed $AR call by re-appending the arguments

archiver/zlib/zlib.conf

@@ -29,8 +29,9 @@ if [ "$SDECFG_STATIC" = "0" ] ; then
 	hook_add postmake 3 "zlib_pm"
 fi
 
+var_append AR " " "rc"
+
 var_append makeinstopt " " "prefix=$root/$prefix"
 var_append makeinstopt " " "libdir=$root/$libdir"
 var_append makeinstopt " " "includedir=$root/$includedir"
 var_append makeinstopt " " "mandir=$root/$mandir"
-