[PATCH] librt: add test (bug 28213)

[Никита Попов]

Hello. I'm submitting a test case for recent bug 28213. It shows the
following results.
Before fix of bug 28213:
# cat ./rt/tst-bz28213.out
Child caused segmentation fault
# cat ./rt/tst-bz28213.test-result
FAIL: rt/tst-bz28213
original exit status 1

After fix of bug 28213:
# cat ./rt/tst-bz28213.out
# cat ./rt/tst-bz28213.test-result
PASS: rt/tst-bz28213
original exit status 0
I managed to get libc cause segmentation fault.
Looking forward to receiving feedback from you.
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