util/httpm: exempt tempfork from TestUsedConsistently

Files under tempfork are vendored copies of upstream code that we
want to keep as close to upstream as possible, so don't require them
to use httpm constants. An upcoming tempfork/acme sync brings in
upstream test files using net/http's method constants.

Updates tailscale/corp#45167

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: If2a90b1d7c5e8f3a6b4d0c9e2a7f5b8d1c4e6a3f

util/httpm/httpm_test.go

@@ -35,6 +35,12 @@ func TestUsedConsistently(t *testing.T) {
 	cmd.Dir = rootDir
 	matches, _ := cmd.Output()
 	for fn := range strings.SplitSeq(strings.TrimSpace(string(matches)), "\n") {
+		if strings.HasPrefix(fn, "tempfork/") {
+			// Files under tempfork are vendored copies of upstream
+			// code that we want to keep as close to upstream as
+			// possible, so don't hold them to this rule.
+			continue
+		}
 		switch fn {
 		case "util/httpm/httpm.go", "util/httpm/httpm_test.go":
 			continue