updated ebiten version from 2.7.9 to 2.9.9

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

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-FileCopyrightText: 2022 The Ebitengine Authors
 
-//go:build darwin || freebsd || linux
+//go:build !cgo && (darwin || freebsd || linux || netbsd)
 
 package fakecgo
 
@@ -27,7 +27,11 @@ func x_cgo_thread_start(arg *ThreadStart) {
 		println("fakecgo: out of memory in thread_start")
 		abort()
 	}
-	// *ts = *arg would cause a writebarrier so use memmove instead
-	memmove(unsafe.Pointer(ts), unsafe.Pointer(arg), unsafe.Sizeof(*ts))
+	// *ts = *arg would cause a writebarrier so copy using slices
+	s1 := unsafe.Slice((*uintptr)(unsafe.Pointer(ts)), unsafe.Sizeof(*ts)/8)
+	s2 := unsafe.Slice((*uintptr)(unsafe.Pointer(arg)), unsafe.Sizeof(*arg)/8)
+	for i := range s2 {
+		s1[i] = s2[i]
+	}
 	_cgo_sys_thread_start(ts) // OS-dependent half
 }