std: Ignore a flaky std::comm test

This test relies on the parent to be descheduled before the child sends its
data. This has proved to be unreliable on libnative on the bots. It's a fairly
trivial test regardless, so ignoring it for now won't lose much.
Add requirements of TotalEq and TotalOrd

Clarify that TotalEq needs an underlying equivalence relation and that TotalOrd
needs a total ordering and specifically named the required (and sufficient)
attributes.
Remove use of block comments in src/libstd/cmp.rs
Fixed broken tutorial link
Remove check-fast. Closes #4193, #8844, #6330, #7416
test: Ignore compile-fail/issue-5806.rs

Broken on BSD. #12460
mk: Pass the name of the make command to maketest.py

This should make BSD use the proper GNU make.
test: Ignore run-make tests that don't work on BSD
Ignore another test that fails mysteriously on BSD
Use ignore-freebsd for tests broken on FreeBSD
Remove ignore-fast that has cropped up
rmake: Fix a test on FreeBSD
auto merge of #13356 : alexcrichton/rust/ignore-flaky, r=huonw

This test relies on the parent to be descheduled before the child sends its
data. This has proved to be unreliable on libnative on the bots. It's a fairly
trivial test regardless, so ignoring it for now won't lose much.
auto merge of #13358 : tbu-/rust/pr_doc_equivrel, r=cmr

Add requirements of TotalEq and TotalOrd

Clarify that TotalEq needs an underlying equivalence relation and that TotalOrd
needs a total ordering and specifically named the required (and sufficient)
attributes.
auto merge of #13363 : free-Runner/rust/patch-1, r=alexcrichton
Fix some windows rpass tests
auto merge of #13288 : alexcrichton/rust/remove-check-fast, r=brson

Rebasing of #12304.
native: Try hard to not malloc on a forked child

This appears to be causing the BSD bots to lock up when looking at the core
dumps I've managed to get. Dropping the `FileDesc` structure triggers the `Arc`
it's contained in to get cleaned up, invoking free(). This instead just closes
the file descriptor (the arc itself is never cleaned up).

I'm still not entirely sure why this is a problem because the pthreads runtime
should register hooks for fork() to prevent this sort of deadlock, but perhaps
that's only done on linux?
auto merge of #13393 : alexcrichton/rust/hopefully-fix-bsd, r=sfackler

This appears to be causing the BSD bots to lock up when looking at the core
dumps I've managed to get. Dropping the `FileDesc` structure triggers the `Arc`
it's contained in to get cleaned up, invoking free(). This instead just closes
the file descriptor (the arc itself is never cleaned up).

I'm still not entirely sure why this is a problem because the pthreads runtime
should register hooks for fork() to prevent this sort of deadlock, but perhaps
that's only done on linux?
sync: remove unsafe and add Send+Share to Deref (enabled by autoderef vtables)