[try 2] slist support (2/2) slist declarations and functions

[Damjan Jovanovic]

Changelog:
* Implemented InitializeSListHead, InterlockedPushEntrySList,
InterlockedPopEntrySList, InterlockedFlushSList, QueryDepthSList, the
ntdll Rtl* equivalents, and added tests.

Damjan Jovanovic
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