app,internal/window: extract native window code to separate package

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/window/egl_android.go

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package window
+
+/*
+#include <EGL/egl.h>
+*/
+import "C"
+
+func (w *window) eglDestroy() {
+}
+
+func (w *window) eglDisplay() _EGLNativeDisplayType {
+	return nil
+}
+
+func (w *window) eglWindow(visID int) (_EGLNativeWindowType, int, int, error) {
+	win, width, height := w.nativeWindow(visID)
+	return _EGLNativeWindowType(win), width, height, nil
+}