[Patch] Allow running 'make check' with PyPy.

Hi, I tried to run 'make check' with PyPy (PyPy3 and PyPy 7.3), but it failed by "To many open files", even if "ulimit -n" returns 175833. I don't think test processes used descriptor so much and I couldn't find what makes the limit so smaller. However I could reduce max number of descriptors si

RE: Assertion error

Looks like my subversion config file is as delivered i.e. all comments. I probably forgot to update it when I got a new machine. So I guess that means the setting is at the default. I've also got that thing where on UNIX you get those extra ^M in the file which I guess is all related. We have a s