view mercurial/cffi/__init__.py @ 44780:f727939f3513 stable

tests: use regular POSIX shell

wait-on-file requires one POSIX extension (sleep with non-integral
argument), but it doesn't require any bash extensions, so just require a
normal POSIX shell. While here, use consistent formatting without
redundant ;

Differential Revision: https://phab.mercurial-scm.org/D8500