ui-shared: Drop filepair_cb_raw() and helper

Remove filepair_cb_raw() and all related functions. These are no longer
needed. We now use Git's internal functions for raw diff formatting
everywhere.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>

ui-shared.h

@@ -67,5 +67,4 @@ extern void cgit_print_snapshot_links(const char *repo, const char *head,
 				      const char *hex, int snapshots);
 extern void cgit_add_hidden_formfields(int incl_head, int incl_search,
 				       const char *page);
-extern void filepair_cb_raw(struct diff_filepair *pair);
 #endif /* UI_SHARED_H */