tests

Fix problem when build_scripts directory does not exist #23

Job	Run time
test_cygwin (39, windows-latest)	7m 16s
docs	30s
test (3.7, -dev, ubuntu-latest)	13s
test (3.7, -dev, macos-latest)	8s
test (3.7, -dev, windows-latest)	7s
test (3.11, -dev, ubuntu-latest)	23s
test (3.11, -dev, macos-latest)	14s
test (3.11, -dev, windows-latest)	9s
test (3.12, -dev, ubuntu-latest)	24s
test (3.12, -dev, macos-latest)	14s
test (3.12, -dev, windows-latest)	9s
test (3.8, ubuntu-latest)	12s
test (3.9, ubuntu-latest)	12s
test (3.10, ubuntu-latest)	13s
test (pypy3.9, ubuntu-latest, stdlib)	19s
test (ubuntu-latest, 3.10, stdlib)	12s
integration-test	0s
check	1s
release	0s
	10m 56s

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