76bd4a groups/261.native_packages_x11.group: libXpm: bump to v3.5.15

Authored and Committed by Redfoxmoon 2 years ago
    groups/261.native_packages_x11.group: libXpm: bump to v3.5.15
    
    Signed-off-by: Ørjan Malde <red@foxi.me>