Support refspecs in about-filter.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
diff --git a/ui-blob.h b/ui-blob.h
index dad275a..d7e7d45 100644
--- a/ui-blob.h
+++ b/ui-blob.h
@@ -1,6 +1,7 @@
 #ifndef UI_BLOB_H
 #define UI_BLOB_H
 
+extern int cgit_print_file(char *path, const char *head);
 extern void cgit_print_blob(const char *hex, char *path, const char *head);
 
 #endif /* UI_BLOB_H */