cmd/go: skip gold-specific part of TestNoteReading if gold is unavailable

The test already contained logic to do this however it did not match
the error "cannot find 'ld'" which appears to be how gcc fails when
ld.gold is missing.

Fixes #22340.

Change-Id: I841248cc489b8fa72bc00a95000ad405f9ef8a4f
Reviewed-on: https://go-review.googlesource.com/72111
Run-TryBot: Michael Munday <mike.munday@ibm.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/go/note_test.go

@@ -54,11 +54,15 @@ func TestNoteReading(t *testing.T) {
 		// Test while forcing use of the gold linker, since in the past
 		// we've had trouble reading the notes generated by gold.
 		err := tg.doRun([]string{"build", "-ldflags", "-buildid=" + buildID + " -linkmode=external -extldflags=-fuse-ld=gold", "-o", tg.path("hello3.exe"), tg.path("hello.go")})
-		if err != nil && (tg.grepCountBoth("invalid linker") > 0 || tg.grepCountBoth("gold") > 0) {
-			// It's not an error if gold isn't there.
+		if err != nil {
+			if tg.grepCountBoth("(invalid linker|gold|cannot find 'ld')") > 0 {
+				// It's not an error if gold isn't there. gcc claims it "cannot find 'ld'" if
+				// ld.gold is missing, see issue #22340.
 				t.Log("skipping gold test")
 				break
 			}
+			t.Fatalf("building hello binary: %v", err)
+		}
 		id, err = buildid.ReadFile(tg.path("hello3.exe"))
 		if err != nil {
 			t.Fatalf("reading build ID from hello binary (linkmode=external -extldflags=-fuse-ld=gold): %v", err)