The version we're currently using is incompatible with a JRE > 8, and
we'll need to update java to be able to use a new gradle

For win64 this will allow us to generate a json test summary.
For all platforms, it also has a better display of the tests results
when run in parallel, while the version we're using on win32 is dumping
all the results at the end.
I'm also hoping that this updated version will fix some of the sporadic
failures.

They are (at least temporarilly) failing quite often. This can
definitely be reverted once the builds don't fail randomly with

E: Failed to fetch http://ftp.fr.debian.org/debian/pool/main/t/taglib/libtag1v5-vanilla_1.11.1%2bdfsg.1-3_amd64.deb
Error reading from server - read (104: Connection reset by peer) [IP: 212.27.32.66 80]

And bump the base image

And switch to the slim image

We're building it right after

Needed for llvm-symbolizer, needed for ASAN/MSAN etc. stack traces

Marvin Scholz authored 4 years ago and Konstantin Pavlov committed 3 years ago

This is needed for the linux/limits.h header that breakpad requires.

And enable verbose output to try and figure out why it doesn't install
properly in DIND

- add missing contrib dependency : gperf
- move to buster
- add $EMSDK_VERSION to better detect errors
- remove unused patch

And bump base images & image dates

Needed for new libplacebo features. Might as well install them all, just
to be on the safe side.

Needed to test the mingw builds. Also add them to the meson crossfiles,
and fix them for modern versions of meson.

Crossfiles are part of the source now.

* Update base image
* Update to gcc 10
* Add qemu-user

There is no user xclient.

And stop building cmake since the packaged version is now recent enough

Which this times includes the modification required to statically
link...