package/xserver_xorg-server: make the version a choice

Only a single entry for now, but we'll add one more in an upcoming
patch, to support old binary-only drivers, like the NVidia Tegra2/3
drivers.

[Thomas:
 - rename option from BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_17_1 to
   BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_17, since we don't want to
   rename the option at each minor release of the X.org server, and
   X.org servers with the same major version will not have a different
   ABI.]

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/x11r7/xserver_xorg-server/Config.in

@@ -56,6 +56,18 @@ config BR2_PACKAGE_XSERVER_XORG_SERVER
 
 if BR2_PACKAGE_XSERVER_XORG_SERVER
 
+choice
+	bool "X Window System server version"
+
+config BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_17
+	bool "1.17.1"
+
+endchoice
+
+config BR2_PACKAGE_XSERVER_XORG_SERVER_VERSION
+	string
+	default "1.17.1" if BR2_PACKAGE_XSERVER_XORG_SERVER_V_1_17
+
 choice
 	prompt "X Window System server type"
 	default BR2_PACKAGE_XSERVER_XORG_SERVER_KDRIVE

package/x11r7/xserver_xorg-server/xserver_xorg-server.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-XSERVER_XORG_SERVER_VERSION = 1.17.1
+XSERVER_XORG_SERVER_VERSION = $(call qstrip,$(BR2_PACKAGE_XSERVER_XORG_SERVER_VERSION))
 XSERVER_XORG_SERVER_SOURCE = xorg-server-$(XSERVER_XORG_SERVER_VERSION).tar.bz2
 XSERVER_XORG_SERVER_SITE = http://xorg.freedesktop.org/releases/individual/xserver
 XSERVER_XORG_SERVER_LICENSE = MIT