Port to the Meson build system

Niels De Graefrequested to merge
nielsdg/uhttpmock:wip/nielsdg/meson into main

Building uhttpmock fails on a clean jhbuild for me thanks to our beloved autotools, which is not ideal (esp for newcomers). The problem has been pointed out several times already, and the solution seems to be to port to Meson, which is what this MR does

Fixes: https://gitlab.com/uhttpmock/uhttpmock/-/issues/10

Edited by Niels De Graef

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