allow to define macros in the config file

Macros can be defined at the top of the configuration file:

	dir = "/var/gemini"
	cert = "/etc/keys"

and re-used later, for example

	server "foo" {
		root "$dir/foo"       # -> /var/gemini/foo
		cert "$cert/foo.pem" # -> /etc/keys/foo.pem
	}

1 files changed, 1 insertions, 0 deletions

diff --git a/gmid.h b/gmid.h
index 34b210d..26ad06c 100644
--- a/gmid.h
+++ b/gmid.h
@@ -314,6 +314,7 @@ void		 drop_priv(void);
 void		 yyerror(const char*, ...);
 int		 parse_portno(const char*);
 void		 parse_conf(const char*);
+int		 cmdline_symset(char *);
 
 /* log.c */
 void		 fatal(const char*, ...)