malloc(0) crashing with SIGABRT

[Petr Skočík]

There's been a twitter discussion on how different POSIX platforms
handle malloc(0): https://twitter.com/sortiecat/status/1170697927804817412 .

As for Cygwin, the answer appears to be "not well", but this should be
easy to fix.

Best regards,
Petr Skocik

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