`icu4c_wasm.patch` is build by :
- Copying config.sub from liblzma source as new version of config.sub there
knows about wasm architecture.
- Copying `mh-linux` on `mh-unknown` as specified in (origin) `mh-unknown`.
This is because icu4c configure doesn't detect `emscripten` platform and
"fallback" to `mh-unknown`.
The source step (install source) always exists.
The `plaformInfo.name` step may not exists
(On mixed target, we build all deps static and the last project dyn)
So the `native_dyn` doesn't exists for `zim-testing-suite`.
We were assuming that meson project correspond to our projects and so we
were always building them, even if they were already compiled.
(This way, a simple `kiwix-build` is enough to recompile the WIP code of
our project).
However, on the CI, we do not archive the source code/build directory in
the base deps archive. So when we try to compile, the compile step of
meson projects fails because the source are not here.
We have a small workaround for pugixml but as zstd is also meson, it is
time to do something correct.
By default, all projects now try to skip if a build is already present.
Our projects are marked as `force_build` and so, they do not try to skip.
Meson use gcc's `-s` option to create the archive.
This option should make gcc meemic `ar` tool but in some version of gcc,
it seems there is a bug and the `-s` option is not taken into account.
See https://github.com/mesonbuild/meson/issues/4138
So, do not try to strip libraries. We will strip the final binaries anyway.
