Gitweb: ignore built file

Signed-off-by: NSverre Rabbelier <srabbelier@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

.gitignore

@@ -155,6 +155,7 @@
 /git-write-tree
 /git-core-*/?*
 /gitk-git/gitk-wish
+/gitweb/GITWEB-BUILD-OPTIONS
 /gitweb/gitweb.cgi
 /gitweb/gitweb.min.*
 /test-chmtime