Increasing the protocol version to 0.22.4 to allow clients to detect
this feature.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1038

It's been 9 years already, and there's no point in insisting on the 21
year old C standard.  MPD doesn't have a lot of C code left, but why
not compile it with the latest language revision.

Since MPD is a long-running daemon, it doesn't make sense to use
dynamic binding.  That allows the relocations to be read-only
("relro"), which a hardening feature.

This commit adds some basic infrastructure for fuzzers, and adds a
fuzzer for the CUE sheet parser.

clocale is part of C++11.

In practical terms, gcc's libstdc++ comes with its own locale defines
when the libc does not have them.

Also reworked to be dependent on !ANDROID.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

We don't support GCC 7 anymore.

This allows automatic optional detection of Sphinx.  This will be
useful when we start building the manpages with Sphinx, which many
users may want to have.

Move build rules from src/output/plugins/meson.build

Since Meson 0.51, there are special build options for "native:true"
builds, prefixed with "build.".  This change breaks cross builds
because `GenParseName.cxx` is no longer built with `-std=c++17`.

This patch adds defaults for "build.c_std" and "build.cpp_std".

Closes https://github.com/MusicPlayerDaemon/MPD/issues/890

For subprojects.

Enables `-Wpedantic`.

This branch isn't yet ready for level 3 (`-Wpedantic`) due to several
C++ violations (e.g. variable length arrays).  These are already
cleaned up in the master branch (0.22).

Work around Meson bug https://github.com/mesonbuild/meson/issues/3672

Commit 60f957ed broken the GCC 7 build, but instead of working
around missing C++17 features in old compilers, let's update the
compiler version requirements.

This commit raises the clang requirement to version 5 because this is
the first version to support `constexpr` lambdas, to be used to
`Dsd2Pcm.cxx`.

The event library uses various libnet.a classes,
e.g. SocketDescriptor.

Switch to std:: functions. Changed the meson check. Works locally.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Prevents compiling those sources many times, once for each debug
program using it.

By accident, this was only enabled for C.