* Remove unneccesary patches
* fix license

gettext bundles libunistring and parts of it, data tables, gets built
and included even when external libunistring is used. The newer external
libunistring (0.9.10) ends up use the data table from the older version
of the bundled libunistring and things goes horribly wrong.

We work around this by exclude unilbrk from the build so we only use
external libunistring.

Upstream bug reports:
https://lists.gnu.org/archive/html/bug-gettext/2018-08/msg00008.html
https://savannah.gnu.org/bugs/index.php?54453

Most of these updates is based on data from https://repology.org/,
detection based on permanent redirect from http:// to https://.

$source urls are updated when they contain $url as substring.

This commit follows release of slibtool-0.5.15.
This commit reverts 2d8ece07.

the 0.19.8 release unintentionally bumped SO version and created a
mess...

- remove some optional dependencies (glib, libcroco) that would
  introduce cyclic dependencies
- remove unneeded patch that break things
- add patch to maintain abi now that build is done right
  fix-abi can be removed when all reverse dependencies have been
  rebuilt and have no libintl_*printf* symbols in them

- unneded dependencies and patches are removed
- add all optional dependencies as described in /DEPENDENCIES file
- shared libs moved to -libs and asprintf moved to -asprintf subpkg

Since abuild v2.22.0, these are removed automatically unless 'libtool'
option has been specified.