build-unit-test-docker: patch meson for C++23 / clang

Meson 1.1.1 advertised support for C++23 but they only actually
implemented it for GCC.  This is good enough for Bitbake builds
and many repositories, but it is insufficient for any repository
that attempts to build in clang or run clang-tidy.

An upstream PR is available to fix this, but it is currently targeted
for Meson 1.3 ( mesonbuild/meson#11986 ).

In the meantime, use a patched version of Meson in order to enable
clang-based building with C++23 repositories.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I640e3f80c9484da5f73272d0004070cd252d03c9
1 file changed