ui-commit: Preserve path limit in links to commit page

This includes adding a path argument to cgit_commit_link() and updating all
its callers. The callers from within the commit page (i.e. the "commit",
"unidiff"/"side-by-side diff" and "parent" links) all preserve the path
limit of the current commit page. All other callers pass NULL (i.e. no path
limit).

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

ui-shared.h

@@ -29,7 +29,8 @@ extern void cgit_log_link(const char *name, const char *title,
 			  const char *pattern, int showmsg);
 extern void cgit_commit_link(char *name, const char *title,
 			     const char *class, const char *head,
-			     const char *rev, int toggle_ssdiff);
+			     const char *rev, const char *path,
+			     int toggle_ssdiff);
 extern void cgit_patch_link(const char *name, const char *title,
 			    const char *class, const char *head,
 			    const char *rev, const char *path);