Update to latest release, which only updates and fixes the autotools
infrastructure and removes the obsolete HTML documentation.
Add trivial -fno-common fix.
ok gnezdo@
Follow the upstream recommendations for packagers and switch to
multi-packages:
devel/gettext -> devel/gettext,-runtime
devel/gettext-tools -> devel/gettext,-tools
(new) devel/gettext,-textstyle