Use MIT shared memory support for X image transfer

Packages describing “shm” as local USE flag

Package “shm” Flag Description
media-libs/imlib2 Use MIT shared memory support for X image transfer
media-libs/libafterimage Use MIT shared memory extention for X image transfer.
media-sound/umurmur Enable shared memory support
media-video/mplayer Enable support for shm
sci-geosciences/gpsd export gpsd over shared memory

All packages providing a “shm” USE flag (2)