rework test for mounted /proc

The previous test assumed that we could always rely on the minor fault
counter to change between reads of /proc/self/stat, but we found that
this is not the case.

The new test compares two reads of /proc/self/environ for which we have
set the same environment variable to two different values.
If the comparison shows the two reads have the same contents, we know
that /proc is not working.

I would like to thank Robin Johnson and Mike Frysinger for their input
for this patch.

X-Gentoo-Bug: 348416
X-Gentoo-Bug-URL: http://bugs.gentoo.org/show_bug.cgi?id=348416

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