Extract clone URL printing to ui-shared.c

This will allow us to reuse the same logic to add clone URL <link/>
elements to the header of all repo-specific pages in order to support
the rel-vcs microformat.

Signed-off-by: John Keeping <john@keeping.me.uk>
diff --git a/ui-shared.h b/ui-shared.h
index fc9be3b..f8cf220 100644
--- a/ui-shared.h
+++ b/ui-shared.h
@@ -11,6 +11,8 @@
 extern char *cgit_pageurl(const char *reponame, const char *pagename,
 			  const char *query);
 
+extern void cgit_add_clone_urls(void (*fn)(const char *));
+
 extern void cgit_index_link(const char *name, const char *title,
 			    const char *class, const char *pattern, const char *sort, int ofs);
 extern void cgit_summary_link(const char *name, const char *title,