Add support in termux

I need to add support in termux but i got complie error

```
# golang.org/x/mobile/app
android.c:170:52: error: incompatible pointer to integer conversion passing 'ANativeWindow *' (aka 'struct ANativeWindow *') to parameter of type 'EGLNativeWindowType' (aka 'unsigned long') [-Wint-conversion]
../usr/include/EGL/egl.h:136:109: note: passing argument to parameter 'win' here
```
