<mutex>: Implement mutex and recursive_mutex on SRW Lock. Support recursion only on recursive_mutex

[AlexGuteniev]

• correctness (constexpr construction)
• no undesired strengthening (recursion on non-recursive deliberately not behaving correctly)
• performance (no dynamic API binding => no control flow guard overhead; no recursion support overhead)

I expect it is already done in ABI-breaking branch.

vNext note: Resolving this issue will require breaking binary compatibility. We won't be able to accept pull requests for this issue until the vNext branch is available. See #169 for more information.

[StephanTLavavej]

Closing as duplicate of #946 (using that one as the primary, even though it was filed later, because it's linked to DevCom/VSO bugs).