vendor dependencies, make some changes to how input is done

vendor/github.com/ebitengine/purego/internal/fakecgo/go_setenv.go

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+//go:nosplit
+//go:norace
+func x_cgo_setenv(arg *[2]*byte) {
+	setenv(arg[0], arg[1], 1)
+}
+
+//go:nosplit
+//go:norace
+func x_cgo_unsetenv(arg *[1]*byte) {
+	unsetenv(arg[0])
+}