git: update for git 2.0

prefixcmp() and suffixcmp() have been remove, functionality is now
provided by starts_with() and ends_with(). Retrurn values have been
changed, so instead of just renaming we have to fix logic.
Everything else looks just fine.

ui-summary.c

@@ -116,7 +116,7 @@ static char* append_readme_path(const char *filename, const char *ref, const cha
 	if (!ref) {
 		resolved_base = realpath(base_dir, NULL);
 		resolved_full = realpath(full_path, NULL);
-		if (!resolved_base || !resolved_full || prefixcmp(resolved_full, resolved_base)) {
+		if (!resolved_base || !resolved_full || !starts_with(resolved_full, resolved_base)) {
 			free(full_path);
 			full_path = NULL;
 		}