ENH: make the Meson that is used user-configurable #20

Job	Run time
msvc (3.11)	3m 36s
mypy	14s
homebrew (3.8)	3m 5s
homebrew (3.11)	2m 31s
cygwin (3.9)	7m 59s
pyston (3.8)	1m 39s
test (ubuntu, 3.7)	16s
test (ubuntu, 3.11)	1m 45s
test (macos, 3.7)	29s
test (macos, 3.11)	3m 6s
test (windows, 3.7)	32s
test (windows, 3.11)	6m 26s
test (ubuntu, pypy-3.9)	6m 9s
test (ubuntu, 3.8)	1m 35s
test (ubuntu, 3.9)	1m 52s
test (ubuntu, 3.10)	2m 0s
test (ubuntu, 3.12-dev)	2m 45s
test (ubuntu, 3.11, ~=0.63.3)	2m 35s
test (ubuntu, 3.11, ~=0.64.0)	1m 57s
test (ubuntu, 3.11, ~=1.0.0)	1m 44s
test (ubuntu, 3.11, ~=1.1.0)	1m 40s
test (ubuntu, 3.11, @git+https://github.com/mesonbuild/meson.git)	2m 6s
test (windows, 3.11, @git+https://github.com/mesonbuild/meson.git)	5m 51s
	1h 1m 52s

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