[issue16595] Add resource.prlimit

[Charles-François Natali]

Charles-François Natali added the comment:

> I didn't expect to see a combination of glibc with prlimit() and Kernel without prlimit(). According to man prlimit it's not suppose to fail with ENOSYS, too.

Yeah, we've seen this several times on some buildbots.
Note that actually, any syscall can fail with ENOSYS: the configure
check just checks that the libc exposes the wrapper library, but when
the libc wrapper makes the actual syscall, the kernel can return
-ENOSYS if it doesn't implement the syscall.

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