[packages] replace @LINUX_2_6 with @!LINUX_2_4, fixes fallout after r23246
drwxr-xr-x - Xorg
drwxr-xr-x - admin
drwxr-xr-x - devel
drwxr-xr-x - ipv6
drwxr-xr-x - lang
drwxr-xr-x - libs
drwxr-xr-x - mail
drwxr-xr-x - multimedia
drwxr-xr-x - net
drwxr-xr-x - skels
drwxr-xr-x - sound
drwxr-xr-x - utils