define GMID_STRING and reuse-it

GMID_VERSION follows the CGI/FastCGI style, i.e. project_name/version.

Define GMID_STRING with a more "human" variant "project_name version",
and reuse that in the --help and --version codepath.

gmid.c

@@ -383,7 +383,7 @@ usage(void)
 	fprintf(stderr,
 	    "usage: %s [-fn] [-c config] [-P pidfile] | [-6h] [-d certs-dir] [-H host]\n"
 	    "       [-p port] [-x cgi] [dir]\n"
-	    "version: gmid 1.7\n",
+	    "version: " GMID_STRING "\n",
 	    getprogname());
 }
 
@@ -579,7 +579,7 @@ main(int argc, char **argv)
 			break;
 
 		case 'V':
-			puts("Version: 1.7");
+			puts("Version: " GMID_STRING);
 			return 0;
 
 		case 'v':

gmid.h

@@ -38,6 +38,7 @@
 
 #include <openssl/x509.h>
 
+#define GMID_STRING	"gmid 1.7"
 #define GMID_VERSION	"gmid/1.7"
 
 #define GEMINI_URL_LEN (1024+3)	/* URL max len + \r\n + \0 */