package/x11r7/xserver_xorg-server: bump version to 1.19.0

package/x11r7/xserver_xorg-server: bump version to 1.19.0

This release bumped video ABI to version 23
https://cgit.freedesktop.org/xorg/xserver/commit/hw/xfree86/common/xf86Module.h?id=8d3f0e964e399dcfa8eb5e85d405217fdc5dbcd4
https://cgit.freedesktop.org/xorg/xserver/commit/hw/xfree86/common/xf86Module.h?id=c07b796b47ae7f5a616d5e8e02ab0f84dc438a93
https://cgit.freedesktop.org/xorg/xserver/commit/hw/xfree86/common/xf86Module.h?id=4af00242ef1e39499b932d12423fdf449296090a

and depends on xlib_libXfont2
https://cgit.freedesktop.org/xorg/xserver/commit/?id=05a793f5b3c40747d5a92a076def7f4fb673c7e7

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>