Rollup of 7 pull requests#76557

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tmandry wants to merge 24 commits intorust-lang:masterfrom

tmandry:rollup-vmbugrh

Commits on Sep 8, 2020

rustbuild: don't set PYTHON_EXECUTABLE and WITH_POLLY cmake vars since they are no longer supported by llvm
matthiaskrgr
committed
Implementation of peer credentials for Unix sockets
Joe Ellis
committed
Remove use of `MaybeUninit` in `ucred.rs`
Joe Ellis
committed
Add basic test for Unix peer credentials
Joe Ellis
committed
Use `u32::MAX` instead of `u32::max_value`

authored and
Joe Ellis
committed
Add pid as an option to UCred struct
Joe Ellis
committed
Move Unix peer credentials tests to their own file
Joe Ellis
committed
Add documentation to public fields of UCred struct
Joe Ellis
committed
Conditionally compile peer credentials feature for supported platforms
Joe Ellis
committed
Use intra-doc links in `core::ptr`
camelid
committed

Commits on Sep 10, 2020