Win32 cross compilation is broken with libvdpau but without libx11

$> ../extras/package/win32/configure.sh --host=i686-w64-mingw32
[...]
checking for X... no
checking X11/Xlib.h usability... no
checking X11/Xlib.h presence... no
checking for X11/Xlib.h... no
checking for VDPAU... yes
configure: error: VDPAU requires Xlib (X11).

apt-get remove libvdpau-dev

$> ../extras/package/win32/configure.sh --host=i686-w64-mingw32
[...]
checking for X... no
checking X11/Xlib.h usability... no
checking X11/Xlib.h presence... no
checking for X11/Xlib.h... no
checking for VDPAU... no
checking for WAYLAND_CLIENT... no
[...]
libvlc configuration
--------------------
version               : 3.0.0-git
system                : mingw32
architecture          : i686 mmx sse sse2
optimizations         : yes
vlc aliases           : cvlc rvlc qvlc svlc

To build vlc and its plugins, type `make', or `./compile' if you like nice colors.

IMHO x11/VDPAU shouldn't be checked to begin with when compiling for win32/win64