os/exec: in TestImplicitPWD, explicitly request the logical path

Fixes #52537

Change-Id: I70959881a31f425e940e7adf86b36be2596aafb7
Reviewed-on: https://go-review.googlesource.com/c/go/+/402158
Run-TryBot: Bryan Mills <[email protected]>
Auto-Submit: Bryan Mills <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: Bryan C. Mills

src/os/exec/exec_posix_test.go

@@ -129,7 +129,7 @@ func TestImplicitPWD(t *testing.T) {
 			// (We could perhaps refactor helperCommand to use a flag or switch on the
 			// value of argv[0] instead, but that doesn't seem worth the trouble at
 			// the moment.)
-			cmd := exec.Command("pwd")
+			cmd := exec.Command("pwd", "-L")
 			cmd.Dir = tc.dir
 
 			var pwds []string