cmd/link/internal/ld: rm os.Getwd from elf_test

When specifying the package to build, a relative path is sufficient.

Change-Id: I1ae08065b5cd77ec25be42dc1e664720a07baa62
Reviewed-on: https://go-review.googlesource.com/c/go/+/610039
Auto-Submit: Ian Lance Taylor <iant@golang.org>
Commit-Queue: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
diff --git a/src/cmd/link/internal/ld/elf_test.go b/src/cmd/link/internal/ld/elf_test.go
index c2a0885..c42a117 100644
--- a/src/cmd/link/internal/ld/elf_test.go
+++ b/src/cmd/link/internal/ld/elf_test.go
@@ -94,14 +94,8 @@
 	t.Parallel()
 
 	dir := t.TempDir()
-
-	wd, err := os.Getwd()
-	if err != nil {
-		t.Fatalf("Failed to get working directory: %v", err)
-	}
-
 	path := filepath.Join(dir, "x")
-	argv := []string{"build", "-o", path, filepath.Join(wd, "testdata", "issue39256")}
+	argv := []string{"build", "-o", path, "./testdata/issue39256"}
 	out, err := testenv.Command(t, testenv.GoToolPath(t), argv...).CombinedOutput()
 	if err != nil {
 		t.Fatalf("Build failure: %s\n%s\n", err, string(out))