package/x11r7/xserver_xorg-server: bump version to 1.20.0

Rebased patch 0001 after upstream commit:
https://cgit.freedesktop.org/xorg/xserver/commit/configure.ac?id=e0748b10a8621066b404d713a76826907da777b9

Removed patch 0004, applied upstream:
https://cgit.freedesktop.org/xorg/xserver/commit/glx/glxscreens.c?id=d16133e3e293fe16b291114d344fbd5a61d5ed65

Added legacy handling for internal version option.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
diff --git a/Config.in.legacy b/Config.in.legacy
index 8afb489..29d5b6a 100644
--- a/Config.in.legacy
+++ b/Config.in.legacy
@@ -145,6 +145,13 @@
 ###############################################################################
 comment "Legacy options removed in 2018.08"
 
+config BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_19
+	bool "Modular X.org server was updated to version 1.20.0"
+	select BR2_LEGACY
+	select BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_20
+	help
+	  Modular X.org server was updated to version 1.20.0
+
 config BR2_PACKAGE_XPROTO_APPLEWMPROTO
 	bool "xproto-applewmproto package replaced by xorgproto"
 	select BR2_LEGACY