checkInputs used to be added to nativeBuildInputs. Now we have
nativeCheckInputs to do that instead. Doing this treewide change allows
to keep hashes identical to before the introduction of
nativeCheckInputs.
Updating to >= 0.7.20 fixes tests on macOS Catalina and newer:
# inet_pton has to be different on Mac OSX *sigh*
assert IPAddress('010.000.000.001', flags=INET_PTON) == IPAddress('10.0.0.1')
> assert int_to_str(0xffff) == '::0.0.255.255'
E AssertionError: assert '::ffff' == '::0.0.255.255'
E - ::0.0.255.255
E + ::ffff