Revert "engine: partially remove legacy Android port, in preparation of new port merge"

This reverts commit ef663a8790.

engine/platform/android/android_priv.h

@@ -0,0 +1,46 @@
+#pragma once
+#ifndef ANDROID_PRIV_H
+#define ANDROID_PRIV_H
+
+#include <EGL/egl.h>
+#include <android/log.h>
+#include <jni.h>
+
+extern struct jnimethods_s
+{
+	jclass actcls;
+	JavaVM *vm;
+	JNIEnv *env;
+	jmethodID enableTextInput;
+	jmethodID vibrate;
+	jmethodID messageBox;
+	jmethodID notify;
+	jmethodID setTitle;
+	jmethodID setIcon;
+	jmethodID getAndroidId;
+	jmethodID saveID;
+	jmethodID loadID;
+	jmethodID showMouse;
+	jmethodID shellExecute;
+	jmethodID swapBuffers;
+	jmethodID toggleEGL;
+	jmethodID createGLContext;
+	jmethodID getGLAttribute;
+	jmethodID deleteGLContext;
+	jmethodID getSelectedPixelFormat;
+	jmethodID getSurface;
+	int width, height;
+} jni;
+
+
+extern struct jnimouse_s
+{
+	float x, y;
+} jnimouse;
+
+//
+// vid_android.c
+//
+void Android_UpdateSurface( qboolean active );
+
+#endif // ANDROID_PRIV_H