cmd/dist: disable misc/cgo/fortran test on dragonfly

Updates #14544.

Change-Id: I24ab8e6f9ad9d290a672216fc2f50f78c3ed8812
Reviewed-on: https://go-review.googlesource.com/21014
Run-TryBot: Mikio Hara <mikioh.mikioh@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/dist/test.go

@@ -445,7 +445,7 @@ func (t *tester) registerTests() {
 		if fortran == "" {
 			fortran, _ = exec.LookPath("gfortran")
 		}
-		if fortran != "" {
+		if fortran != "" && t.goos != "dragonfly" { // see golang.org/issue/14544
 			t.tests = append(t.tests, distTest{
 				name:    "cgo_fortran",
 				heading: "../misc/cgo/fortran",