Remove -a option, add contrib directory

There wasn't actually any authentication code in eris.c.  I'll add it
back in if anybody asks.

contrib/README

@@ -0,0 +1,9 @@
+This directory contains little wrappers to help make your life
+running a full Internet-facing web server (such as woozle.org)
+a little easier.
+
+Quite a lot of web software these days is written to work with
+Apache and nothing else.  PHP is a notable example: even PHP-CGI,
+as shipped on Debian, requires special environment variables that
+only Apache sets, and doesn't work with eg. mathopd, boa, busybox
+httpd, or eris.

contrib/g.cgi.c

@@ -0,0 +1,31 @@
+/** g.cgi - CGI interface to cgit and git-http-backend
+  *
+  * This is a simple CGI to invoke cgit with a configuration
+  * file of your choice.  It will also invoke git-http-backend
+  * if appropriate, which in my (very light) testing runs about
+  * twice as fast as plain HTTP with git-update-server-info.
+  */
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+/* Set these to appropriate paths */
+#define CGIT_CONFIG "/home/neale/public_html/cgitrc"
+#define GIT_PROJECT_ROOT "/home/neale/projects"
+
+int
+main(int argc, char *argv[])
+{
+    char *uri = getenv("REQUEST_URI");
+
+    if (uri && strstr(uri, "git-upload-pack")) {
+        /* Use git-http-backend for great speed! */
+        setenv("GIT_PROJECT_ROOT", GIT_PROJECT_ROOT, 1);
+        execlp("git", "git", "http-backend", NULL);
+    } else {
+        setenv("CGIT_CONFIG", CGIT_CONFIG, 1);
+        execlp("cgit", "cgit", NULL);
+    }
+
+    return 0;
+}

eris.c

@@ -79,7 +79,6 @@
 /*
  * Options
  */
-int             doauth = 0;
 int             docgi = 0;
 int             doidx = 0;
 int             nochdir = 0;
@@ -245,11 +244,8 @@ parse_options(int argc, char *argv[])
 {
     int             opt;
 
-    while (-1 != (opt = getopt(argc, argv, "acdhkprv."))) {
+    while (-1 != (opt = getopt(argc, argv, "cdhkprv."))) {
         switch (opt) {
-            case 'a':
-                doauth = 1;
-                break;
             case 'c':
                 docgi = 1;
                 break;
@@ -273,7 +269,6 @@ parse_options(int argc, char *argv[])
                 fprintf(stderr, "Usage: %s [OPTIONS]\n",
                         argv[0]);
                 fprintf(stderr, "\n");
-                fprintf(stderr, "-a         Enable authentication\n");
                 fprintf(stderr, "-c         Enable CGI\n");
                 fprintf(stderr, "-d         Enable directory listing\n");
                 fprintf(stderr, "-.         Serve out of ./ (no vhosting)\n");