Meson port

[SuborbitalPigeon]

It complains about the config file not having enough planes, despite the config file being in the right place.

[SuborbitalPigeon]

Should also mention I dropped checks for:

• stdbool.h
• malloc ()
• atexit ()
• sqrt ()
• strtol ()

Because any decent stdlib will have those now (they're not even C99 after all).