vendor dependencies, make some changes to how input is done

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

@@ -0,0 +1,19 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+import _ "unsafe" // for go:linkname
+
+//go:linkname x_cgo_setenv_trampoline x_cgo_setenv_trampoline
+//go:linkname _cgo_setenv runtime._cgo_setenv
+var x_cgo_setenv_trampoline byte
+var _cgo_setenv = &x_cgo_setenv_trampoline
+
+//go:linkname x_cgo_unsetenv_trampoline x_cgo_unsetenv_trampoline
+//go:linkname _cgo_unsetenv runtime._cgo_unsetenv
+var x_cgo_unsetenv_trampoline byte
+var _cgo_unsetenv = &x_cgo_unsetenv_trampoline