Merge remote-tracking branch 'remotes/kraxel/tags/ui-20201014-pull-request' into staging

ui: fixes for sdl, curses, vnc, input-linux.

# gpg: Signature made Wed 14 Oct 2020 09:21:35 BST
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>" [full]
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>" [full]
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>" [full]
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/ui-20201014-pull-request:
  ui: Fix default window_id value
  input-linux: Reset il->fd handler before closing it
  SDL: enable OpenGL context creation
  vnc-stubs: Allow -vnc none
  configure: Fixes ncursesw detection under msys2/mingw by convert them to meson
  win32: Simplify gmtime_r detection not depends on if _POSIX_C_SOURCE are defined on msys2/mingw
  curses: Fixes curses compiling errors.
  curses: Fixes compiler error that complain don't have langinfo.h on msys2/mingw
  qemu-edid: drop cast

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>