Meson buildsystem support

[notxvilka]

Would you accept a PR to add support for building with Meson buildsystem? It has two implementations and quite popular in pure C world:

• https://mesonbuild.com
• https://muon.build

Once it's done, it could be even published on the Meson wraps repository, so that other projects could use it with ease:

• https://mesonbuild.com/Adding-new-projects-to-wrapdb.html