xserver-xorg: add PACKAGECONFIG for xvfb

Xvfb is pretty niche and has outstanding unsolved security issues, so
let people disable it and add a conditional CVE_STATUS to reflect this.

(From OE-Core rev: 5d47474f6eb6b4441154c7de7261f8e0ab47333d)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-xserver/xserver-xorg.inc

@@ -116,14 +116,13 @@ FILES:xf86-video-modesetting = "${libdir}/xorg/modules/drivers/modesetting_drv.s
 
 EXTRA_OEMESON += " \
                  -Dxnest=false \
-                 -Dxvfb=true \
                  -Ddtrace=false \
                  -Dint10=x86emu \
                  -Dxkb_output_dir=/var/lib/xkb \
 "
 
 OPENGL_PKGCONFIGS = "dri glx glamor dri3"
-PACKAGECONFIG ??= "dga dri2 udev ${XORG_CRYPTO} \
+PACKAGECONFIG ??= "dga dri2 udev xvfb ${XORG_CRYPTO} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'opengl', '${OPENGL_PKGCONFIGS}', '', d)} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'systemd-logind', '', d)} \
 "
@@ -138,6 +137,7 @@ PACKAGECONFIG[glamor] = "-Dglamor=true,-Dglamor=false,libepoxy virtual/libgbm,li
 PACKAGECONFIG[unwind] = "-Dlibunwind=true,-Dlibunwind=false,libunwind"
 PACKAGECONFIG[systemd-logind] = "-Dsystemd_logind=true,-Dsystemd_logind=false,dbus,"
 PACKAGECONFIG[xinerama] = "-Dxinerama=true,-Dxinerama=false"
+PACKAGECONFIG[xvfb] = "-Dxvfb=true,-Dxvfb=false"
 
 # Xorg requires a SHA1 implementation, pick one
 XORG_CRYPTO ??= "openssl"
@@ -175,3 +175,5 @@ python populate_packages:prepend() {
     d.appendVar("RPROVIDES:" + pn, " " + get_abi("input"))
     d.appendVar("RPROVIDES:" + pn, " " + get_abi("video"))
 }
+
+CVE_STATUS[CVE-2023-5574] = "${@bb.utils.contains('PACKAGECONFIG', 'xvfb', '', 'not-applicable-config: specific to Xvfb', d)}"