In 0.4.1.1-alpha I introduced a bug where we would require and
ignore a single positional argument.

Fixes bug 31772.

"ours" merge to avoid picking up 0.2.9 version of ticket 31673.

tor_isinf() was new in 0.4.0, and also needs to look at the
same rules as clamp_double_to_i64()

These errors can occur if we are built on a system with support for
madvise(MADV_NOFORK) but then we are run on a system whose kernel
does not support that flag.

If the error is something that we don't tolerate at all, we now log
it before crashing.

Fixes bug 31696.  I am calling this a bugfix on 0.4.1.1-alpha, where
we actually started using the map_anon code.

This is similar to, but not the same as, the fix for #31570.

Our code assumes that when we're configured to get IPv6 addresses
out of a TRANS_PF transparent proxy connection, we actually will.
But we didn't check that, and so FreeBSD started warning us about a
potential NULL pointer dereference.

Fixes part of bug 31687; bugfix on 0.2.3.4-alpha when this code was
added.

We used to do this on Windows only, but it appears to affect
multiple platforms when building with certain versions of GCC, and a
common pattern for defining the floating-point classifier functions.

Fixes part of 31687. I'm calling this a bugfux on 31687, when we
started suppressing these warnings on Windows.

Closes #31673

Closes #31673

tor-github/pr/1283, with the following changes:
* cherry-pick the merge commit in 1283 on top of...
* tor-github/pr/1174, but with the last commit re-worded to remove
    the fixup, because fixups break our push rules.

This is an "ours" merge, except for the bugfix version change in
changes/bug30649.

tor-github/pr/1174, but with the last commit re-worded to remove
the fixup, because fixups break our push rules.

These errors can occur if we are built on a system with support for
madvise(MADV_NOFORK) but then we are run on a system whose kernel
does not support that flag.

If the error is something that we don't tolerate at all, we now log
it before crashing.

Fixes bug 31570.  I am calling this a bugfix on 0.4.1.1-alpha, where
we actually started using the map_anon code.

This fixes LTO compilation for Android and -O0 compilation in
general, when --disable-module-dirauth is provided.

Fixes bug 31552; bugfix on 0.4.1.1-alpha.

This change makes test-stem faster and more reliable.

Use "make test-stem-full" to run all of stem's tests.

Closes ticket 31554.