app/internal/egl: don't call eglTerminate

A single EGL display may be shared among several contexts. Don't
eglTerminate a context display when destroying the context.

Updates gio#144

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

app/internal/egl/egl.go

@@ -70,8 +70,6 @@ func (c *Context) Release() {
 	c.ReleaseSurface()
 	if c.eglCtx != nil {
 		eglDestroyContext(c.disp, c.eglCtx.ctx)
-		eglTerminate(c.disp)
-		eglReleaseThread()
 		c.eglCtx = nil
 	}
 	c.disp = nilEGLDisplay