build: let meson add compiler flags for libstdc++ assertions

We have manually enabled libstdc++ assertions since cl/797. Meson 1.4.0
(the minimum version we mandate) enables this by default, so we can
remove the enabling compiler flag from the list of project arguments.

With this patch, `-D_GLIBCXX_ASSERTIONS=1` is still present in the
compile command logs when building with both gccStdenv and clangStdenv.

See: https://gerrit.lix.systems/c/lix/+/797
See: https://mesonbuild.com/Release-notes-for-1-4-0.html#ndebug-setting-now-controls-c-stdlib-assertions
Change-Id: I53483fadfe5cbd11ba35544b437d3a9ee8031631

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