[analyzer] Do not check if sys/queue.h file is a system header.

In most cases it is, by just looking at the name. Also, this check prevents the heuristic from working in strange user settings.
radar://13839692

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181615 91177308-0d34-0410-b5e6-96231b3b80d8