See the [Meson website] for a full reference. To build, test and/or
install the folks library, you essentially need the following commands:

```
$ meson build
$ ninja -C build
$ meson test -C build
$ ninja -C build install
```

Note that there is no one-on-one mapping sometimes from the autotools build to
the meson build definitions, so here's a non-comprehensive list of changes:

* Vala support is now mandatory.
* Since meson doesn't have libtool's `export-symbols-regex`, we need to
write our own little linker script to make sure we're not accidentally
exporting symbols we shouldn't be exposing (such as
_libfolks-internal_'s functions).
* Meson has [built-in support for lcov], see the online reference for more info.
* Meson also has built-in support for Valgrind by adding the `--wrap=valgrind`
option.
* There is no wildcard support in Meson (for good reasons), so instead
we need to re-use the definitions found in the backend library's
meson.build files to have the correct source files for the valadoc
modules.

[Meson website]: http://mesonbuild.com/
[built-in support for lcov]: http://mesonbuild.com/Unit-tests.html#coverage