Ruby 2.7.0 has attributes that are ignored because they're
misplaced in code included by headers.  Ignore those warnings since
we can't fix them.

Ruby 2.7.0 uses an __error__ attribute that isn't understood by
Clang.  Suppress that error.

Switching the Ruby test to Minitest caused it to stop running.
Set it to autorun, and then change assert_raise to assert_raises.

Replace File.exists? with File.exist? to get rid of deprecation
warnings.

Include Ruby's config.h before ours because Ruby unconditionally
defines a bunch of special C macros that can't subsequently be
undefined or redefined.  Autoconf's generated config.h handles
this properly, so we can put it second.

Ruby 3.0 uses declarations after statements in inlined code, so
we have to suppress that GCC warning.

The default example was using some obsolete tcpserver command.
Reorganize and update it to reference systemd, inetd, and
stand-alone mode explicitly.

Fix the copyright statement.

Document sending SIGHUP to remctld when running in stand-alone mode to
ask it to re-read its configuration file, and document that SIGTERM
will cause it to exit.  (Fixes #30)

cppcheck thinks its argument can be const, which while technically
true would be weird since it invalidates its argument.  Free the
passed argument instead of the static variable to avoid this
diagnostic.

The function makes a copy of its argument, so the argument can be
const.  Detected by cppcheck.

Now that the allocation functions in tap/basic.h are tagged with
deallocation functions, stdlib.h has to be included to get the
prototype for free.

GCC 11 allows marking functions with their deallocation function
when using the __malloc__ attribute.  Add those annotations to the
public and internal interfaces, with portability code to hide the
argument on older compilers.

Matching the NEWS documentation, require Perl 5.10 for all the
Perl libraries and test programs and update the overall
documentation accordingly.

Update the DocKnot configuration for the latest DocKnot.  Document
that PCRE2 is now supported.  Mention the Ruby bindings in another
place where all the bindings were listed.  Update the description
to refer to more recent RPC systems that people will be more
familiar with.

Guard a possibly unused variable with the appropriate preprocessor
conditional.

Document that pcre and regex ACL expressions are not automatically
anchored at the start and end of the principal name, so they should be
explicitly anchored in the configuration unless one intends to allow
partial matches.

Add support for PCRE2 for pcre ACLs and use it by preference over
PCRE1 if it is found.  UTF-8 regular expressions are not enabled by
default, but can be enabled by adding (*UTF) to the beginning of the
regular expression.

Use minitest for Ruby tests

Remove more references to pytest-runner

This will probably be dropped soon, but for now fix mypy testing
of the Python module with Python 2, which requires an additional
dependency.  This should fix a CI failure.

phpize or the PHP build system now creates a new *.dep file, which
we need to ignore when checking for SPDX license declarations.

Pick up the changes from the new .clang-format file from
rra-c-util.  Reorder some things in util/protocol.h so that
clang-format won't try to indent the value of the header guard
macro.

Perl style checks should pass correctly with this module installed,
adding some additional checks.

Update to the latest versions, and use the major version dependency
for install-with-cpanm.

The default branch has been renamed from master to main.

The Perl libraries and the remctl test suite now require Perl 5.10 or
later.

* Fix IN6_ARE_ADDR_EQUAL Autoconf probe on macOS.
* Fix compiler flag probes with Clang.
* Check that Kerberos headers can be included.
* Fix util/fdflag test on Solaris 11 and OpenBSD.
* Suppress some additional warnings in GCC 10.

There are also lots of formatting changes from the updates to
clang-format and the Perl formatting rules, and various updates
to comments and other non-user-visible changes.

Replace some obsolete macros with their new names.  Add configure~
to .gitignore, since Autoconf now generates it.  Drop AC_PROG_INSTALL
which no longer seems to be needed (remctl never calls install
directly).

Update my current employer, remove a now-unnecessary DOCTYPE
setting that current xml2rfc complains about, and add the
now-recommended submissionType attribute.

The current version of xml2rfc has changed its command-line
interface and now doesn't want one to specify the output file.

Ruby 1.9+ uses Minitest as the backend for Test::Unit. This shim has
lost some backwards compatibility over time and it no longer works on
Fedora 35. Update the test suite to use minitest directly.

gnu-zero-variadic-macro-arguments is a new Clang warning that
triggers for Ruby code.

Disable implicit-fallthrough warnigns in Clang when building Perl
code, since in at least Perl 5.30 there is inline hash code that
uses this pattern.  It has the magic comments, but the latest Clang
has stopped supporting those.