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Fixes bug 34233.

(This has bug has been backported to 0.3.5, but only released in
0.4.3, so it only needs a changes file there.)

This macro defers to __attribute__((fallthrough)) on GCC (and
clang).  Previously we had been using GCC's magic /* fallthrough */
comments, but clang very sensibly doesn't accept those.

Since not all compiler recognize it, we only define it when our
configure script detects that it works.

Part of a fix for 34078.

And update the changes file to be more specific.

Part of 32191.

eighthave authored Oct 29, 2019 and teor committed Nov 05, 2019

The current pkg-config setup has no sense of whether it is cross-compiling,
so it will detect things on the build system that are not present or are
wrong for the host system.  This forces the cross-compiling build to only
look for pkg-config .pc files in --prefix.

A version of this has been the setup for many years with the Android builds.

Fixes #32191
Signed-off-by: Hans-Christoph Steiner <hans@eds.org>

Fixes bug 32124; bugfix on 0.3.5.1-alpha.

Fixes bug 32124; bugfix on 0.2.0.20-rc.

Fixes bug 32134; bugfix on 0.3.4.1-alpha.

Part of 32123.

Part of 31922.

When pkg-config is not installed, or a library that depends on
pkg-config is not found, tell the user what to do to fix the
problem.

Fixes bug 31922; bugfix on 0.3.1.1-alpha.

Explain what the optional Directory Authority module is, and what
happens when it is disabled.

Fixes bug 31825; bugfix on 0.3.4.1-alpha.