vendor dependencies, make some changes to how input is done

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

@@ -0,0 +1,19 @@
+// Copyright 2010 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
+
+// The runtime package contains an uninitialized definition
+// for runtime·iscgo. Override it to tell the runtime we're here.
+// There are various function pointers that should be set too,
+// but those depend on dynamic linker magic to get initialized
+// correctly, and sometimes they break. This variable is a
+// backup: it depends only on old C style static linking rules.
+
+package fakecgo
+
+import _ "unsafe" // for go:linkname
+
+//go:linkname _iscgo runtime.iscgo
+var _iscgo bool = true