TST: test the use of a custom `meson.py` script #24

Job	Run time
pyston (3.8)	1m 27s
cygwin (3.9)	10m 0s
msvc (3.11)	4m 6s
homebrew (3.8)	3m 2s
homebrew (3.11)	2m 38s
mypy	25s
test (ubuntu, 3.7)	32s
test (ubuntu, 3.11)	2m 8s
test (macos, 3.7)	29s
test (macos, 3.11)	3m 4s
test (windows, 3.7)	35s
test (windows, 3.11)	8m 47s
test (ubuntu, pypy-3.9)	4m 35s
test (ubuntu, 3.8)	1m 53s
test (ubuntu, 3.9)	1m 36s
test (ubuntu, 3.10)	1m 58s
test (ubuntu, 3.12-dev)	2m 54s
test (ubuntu, 3.11, ~=0.63.3)	1m 57s
test (ubuntu, 3.11, ~=0.64.0)	2m 8s
test (ubuntu, 3.11, ~=1.0.0)	1m 57s
test (ubuntu, 3.11, ~=1.1.0)	1m 57s
test (ubuntu, 3.11, @git+https://github.com/mesonbuild/meson.git)	2m 14s
test (windows, 3.11, @git+https://github.com/mesonbuild/meson.git)	6m 2s
	1h 6m 24s

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