bc8958 groups/261.native_packages_x11.group: libXext: bump to v1.3.4

Authored and Committed by Redfoxmoon 2 years ago
    groups/261.native_packages_x11.group: libXext: bump to v1.3.4
    
    Signed-off-by: Ørjan Malde <red@foxi.me>