Merge branch 'cc/starts-n-ends-with'

Remove a few duplicate implementations of prefix/suffix comparison
functions, and rename them to starts_with and ends_with.

* cc/starts-n-ends-with:
  replace {pre,suf}fixcmp() with {starts,ends}_with()
  strbuf: introduce starts_with() and ends_with()
  builtin/remote: remove postfixcmp() and use suffixcmp() instead
  environment: normalize use of prefixcmp() by removing " != 0"

builtin/fast-export.c

@@ -476,7 +476,7 @@ static void handle_tag(const char *name, struct tag *tag)
 		}
 	}
 
-	if (!prefixcmp(name, "refs/tags/"))
+	if (starts_with(name, "refs/tags/"))
 		name += 10;
 	printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
 	       name, tagged_mark,