Some operating systems (e.g. CentOS, OpenBSD) install the main pytest
script as "py.test-3". Add that name to the list of names passed to
AC_PATH_PROGS() in order for pytest to be properly detected on a broader
range of operating systems.
(cherry picked from commit
d5562a3e7e9edf6d5ff8a7873f15dea42edb1fc4)
;;
esac
-AC_PATH_PROGS([PYTEST], [pytest-3 pytest pytest-pypy], [])
+AC_PATH_PROGS([PYTEST], [pytest-3 py.test-3 pytest pytest-pypy], [])
AS_IF([test -z "$PYTEST"],
[AC_MSG_WARN([pytest not found, some system tests will be skipped])])
AC_SUBST([PYTEST])