Simplify Nginx directive with case-insensitive match.

Author: iredmail

config/nginx/z-push.conf

@@ -32,15 +32,7 @@ server {
         include snippets/z-push-php.conf;
     }
 
-    location /AutoDiscover/AutoDiscover.xml {
-        include snippets/z-push-autodiscover.conf;
-        include snippets/z-push-php.conf;
-    }
-    location /Autodiscover/Autodiscover.xml {
-        include snippets/z-push-autodiscover.conf;
-        include snippets/z-push-php.conf;
-    }
-    location /autodiscover/autodiscover.xml {
+    location ~* ^/AutoDiscover/AutoDiscover.xml$ {
         include snippets/z-push-autodiscover.conf;
         include snippets/z-push-php.conf;
     }