Backported: signal: allow to send any siginfo to itself

Fixes the problem with bionic tests:
[  FAILED  ] signal.rt_tgsigqueueinfo (60 ms)
bionic/tests/signal_test.cpp:(401) Failure in test signal.rt_tgsigqueueinfo
Value of: syscall((0 + 363), getpid(), gettid(), 10, &sent)
  Actual: -1
Expected: 0
rt_tgsigqueueinfo failed: Operation not permitted
Please ensure that the following kernel patch has been applied:
* https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=66dd34ad31e5963d72a700ec3f2449291d322921

signal.rt_tgsigqueueinfo exited with exitcode 1.

Change-Id: I92c350551fab8b4c6ee3789705689c7fac590eab
1 file changed