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intltool has long been dead upstream. Let's not poke the dead corpse, please. This commit is quite large, but that's mostly since trying to support a hybrid of both gettext and intltool with both Meson and Autotools was really hard, so I stopped trying. Due to gettext relying on quite some things being at the exactly right place in the autotools build (like `ABOUT-NLS` and `config.rpath`) we really needed to cleanup the `autogen.sh` to only call `aclocal` and `autoreconf`. No more strange magic; I tried to do it without changing too much in the file, and things just broke. If people want to do something more custom, they can just change the script directly. This change also uncovered some problems in our `configure.ac`, like using deprecated macros. The following major changes happened: * meson: Changed `custom_target()` to `i18n.merge_file()` for all supported file types * Added `.its` and `.loc` files for the GIMP-specific XML formats, so that gettext understand...
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