internal/buildinfo: stop testing the windows/arm port

The windows/arm port was marked broken and is removed in Go 1.26.

For #71671.
Fixes #74934.

Change-Id: I2e80641fa2cba1a63b482a6ff46e1652a5497835
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/694215
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>

internal/buildinfo/additions_scan_test.go

diff --git a/internal/buildinfo/additions_scan_test.go b/internal/buildinfo/additions_scan_test.go
index 7f1b112..b0d4921 100644
--- a/internal/buildinfo/additions_scan_test.go
+++ b/internal/buildinfo/additions_scan_test.go
@@ -24,8 +24,9 @@
 func testAll(t *testing.T, gooss, goarchs []string, ft func(*testing.T, string, string)) {
 	// unsupported platforms for building Go binaries.
 	var unsupported = map[string]bool{
-		"darwin/386": true,
-		"darwin/arm": true,
+		"darwin/386":  true,
+		"darwin/arm":  true,
+		"windows/arm": true, // go.dev/issue/71671
 	}
 
 	for _, g := range gooss {