vendor dependencies, make some changes to how input is done

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

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+type (
+	size_t         uintptr
+	sigset_t       [128]byte
+	pthread_attr_t [64]byte
+	pthread_t      int
+	pthread_key_t  uint64
+)
+
+// for pthread_sigmask:
+
+type sighow int32
+
+const (
+	SIG_BLOCK   sighow = 0
+	SIG_UNBLOCK sighow = 1
+	SIG_SETMASK sighow = 2
+)
+
+type G struct {
+	stacklo uintptr
+	stackhi uintptr
+}
+
+type ThreadStart struct {
+	g   *G
+	tls *uintptr
+	fn  uintptr
+}