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i#3911: Support NULL sigmask parameter passed to pselect, ppoll, epoll_pwait.

Merged Hendrik Greving requested to merge i3911-pselect6-null-mask into master

While the glibc wrapper seems to always pass a valid pointer to the kernel, the latter does accept NULL pointers. This patch adds support to handle pselect6, ppoll, and epoll_pwait system calls with NULL sigmask parameter.

Adds tests for above.

Fixes #3911 (closed)