Get number of '%' signs right in param.show message for cc_command.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1885 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/mgt_param.c

@@ -731,7 +731,7 @@ static struct parspec parspec[] = {
 	{ "cc_command", tweak_cc_command,
 		"Command used for compiling the C source code to a "
 		"dlopen(3) loadable object.\n"
-		"NB: The string must contain two %%s sequences which "
+		"NB: The string must contain two %s sequences which "
 		"will be replaced by the binary and source file names "
 		"respectively.\n"
 		MUST_RELOAD,