add libXbgi licence
introduce app-text/sandy
mask sandy[~scm]
categories.conf: add sys-devel
introduce sys-devel/bin86

this is naughty, must submit patch asap.
ecwolf: use exlib_export_phases and style
quakespasm: use export_exlib_phases and style
vavoom: use export_exlib_phases and style
doomseeker: use $LIBDIR