app/internal/window: x11 driver

This driver still lacks fling support and dp/sp configuration.

By default, linux builds will try to use the Wayland driver then
fallback to X11 if it fails. Drivers can be disabled by using either the
nowayland or nox11 build tags.

Signed-off-by: Denis Bernard <db047h@gmail.com>

app/internal/window/egl_linux.go

@@ -12,8 +12,6 @@ package window
 */
 import "C"
 
-import "gioui.org/app/internal/gl"
-
 type (
 	_EGLint               = C.EGLint
 	_EGLDisplay           = C.EGLDisplay
@@ -94,7 +92,3 @@ func eglCreateWindowSurface(disp _EGLDisplay, conf _EGLConfig, win _EGLNativeWin
 	eglSurf := C.eglCreateWindowSurface(disp, conf, win, &attribs[0])
 	return eglSurf
 }
-
-func (w *window) NewContext() (gl.Context, error) {
-	return newContext(w)
-}