cmd/nm: report windows/arm as relocatable in TestGoExec

Updates #26148

Change-Id: I704efafca39e4397caf2db0146d83d309c761dd1
Reviewed-on: https://go-review.googlesource.com/c/154357Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/nm/nm_test.go

@@ -151,6 +151,9 @@ func testGoExec(t *testing.T, iscgo, isexternallinker bool) {
 				return true
 			}
 		}
+		if runtime.GOOS == "windows" && runtime.GOARCH == "arm" {
+			return true
+		}
 		return false
 	}