[PATCH] support: Enhance support_need_proc

[DJ Delorie]

Florian Weimer <fweimer@redhat.com> writes:
> The xmkdirp-related check in nss/tst-reload2 looks unrelated to /proc,
> so remove it.
>
> DJ, do you know why it is there?  Is it perhaps checking for something
> else by proxy?

As noted in the sources, /proc must be present for the id mapping to
work, so that xmkdirp succeeds.  This is a container-related issue, and
tst-reload2 is a container test.