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 <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Dmitri Shuralyov <[email protected]>
Reviewed-by: Roland Shoemaker <[email protected]>

Author: dmitshur

internal/buildinfo/additions_scan_test.go

@@ -24,8 +24,9 @@ import (
 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 {