News in 4.2.1, 2019-11-21
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Changes for packagers:
* Documentation: GTK+ -> GTK. Please update the description of the package.

Other changes:
* Fix a few compilation warnings.
* Better use of errno (save its value ASAP, then reset it to 0).
* Build from Git:
 - Allow building with gettext ≥ 0.20.
 - Adapt for AX_CODE_COVERAGE API break in autoconf-archive version 2019.01.06.
 (this didn't affect the build from the previous tarball, since the Autotools
 are "bundled" with the tarball).
* Translation updates.