checklibs needs to grep for the cfg_* prefix in lib/isccfg

lib/isccfg/win32/libisccfg.def

@@ -102,6 +102,7 @@ cfg_parser_reset
 cfg_parser_setcallback
 cfg_parser_warning
 cfg_peektoken
+cfg_pluginlist_foreach
 cfg_print
 cfg_print_boolean
 cfg_print_bracketed_list

util/checklibs.sh

@@ -94,6 +94,7 @@ do
     test -z "$dirs" && continue;
     pat=$lib
     test $lib = dns && pat='\(dns\|dst\)'
+    test $lib = isccfg && pat='cfg'
     pat="^${pat}_[a-z0-9_]*("
     list=`git ls-files -c $dirs | grep '\.h$' |
 	  xargs grep "$pat" |