more documentation of scripts. disable java for gettext. disable docs for fontconfig
change gettext-tarball-existance test to use .gz not .xz, since the
download/unpack use gz (and gz is more portable than xz)
change gettext detection (libintl is part of gnu libc not gettext). also
disable native java in gettext. disable redundant glib build.
change gettext detection (libintl is part of gnu libc not gettext?)