cmd/go: skip test using external linking on linux/ppc64 too

While we're at it, also fix a typo.

Change-Id: Id436f33cffa5683e2a8450cce5b545960cf2877e
Reviewed-on: https://go-review.googlesource.com/13878Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/go/go_test.go

@@ -671,7 +671,7 @@ func TestGoBuildDashAInDevBranch(t *testing.T) {
 	tg.grepStderr("runtime", "testgo build -a math in dev branch DID NOT build runtime, but should have")
 }
 
-func TestGoBuilDashAInReleaseBranch(t *testing.T) {
+func TestGoBuildDashAInReleaseBranch(t *testing.T) {
 	if testing.Short() {
 		t.Skip("don't rebuild the standard library in short mode")
 	}

src/cmd/go/note_test.go

@@ -24,7 +24,7 @@ func TestNoteReading(t *testing.T) {
 		t.Fatalf("buildID in hello binary = %q, want %q", id, buildID)
 	}
 
-	if runtime.GOOS == "linux" && runtime.GOARCH == "ppc64le" {
+	if runtime.GOOS == "linux" && (runtime.GOARCH == "ppc64le" || runtime.GOARCH == "ppc64") {
 		t.Skipf("skipping - golang.org/issue/11184")
 	}