Linux has reworked its header install process in
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=59b2bd05f5f4dc62979c2e82ddd384f07e8f10bc
It has introduced `make headers` that prepares the headers in ./usr/include, and
made `make headers_install` copy the headers from there using rsync.

qtdeclarative is an optional dependency for some parts of qttools:
without it, the lupdate binary is not able to process qml files for
translatable strings.

See #78994 (comment)

qttools: Add qtdeclarative to buildInputs

linuxHeaders: 4.19.16 -> 5.5

openblas: 0.3.7 -> 0.3.8

go-jsonnet: 0.14.0 -> 0.15.0

gitAndTools.gitRemoteGcrypt: 1.2 -> 1.3

This also switches the build from Autotools to Meson. The only
difference should be that the libtool archives (.la files) aren't
generated anymore.
Additionally I've updated the meta attributes and added myself as
maintainer.

The changelog is in the final release announcement [0] and an overview
of most commits is in the alpha release announcement [1].

[0]: https://lists.freedesktop.org/archives/wayland-devel/2020-February/041207.html
[1]: https://lists.freedesktop.org/archives/wayland-devel/2020-January/041140.html

But don't build the documentation by default.

The build sandbox provides only wayland-scanner and not the library and
the wayland-egl symbols check test must use nm prefixed with the target
triplet.

wayland: 1.17.0 -> 1.18.0

libgee: 0.20.2 -> 0.20.3

This should improve the speed of bootstrapping process.
Cost of evaluation also decreases a bit,
but I don't expect that will be significant.

Thanks to python3Minimal.  This reverts part of c203848 #79738.

glibc: use python3Minimal instead of python3

- Init libuninameslist at 20190701 as it is a new dependency to fontforge
- Remove gnulib, as it is not used anymore
- Remove a non-applying patch
- Add myself as maintainer