To avoid those cases where a plugin does not need a helper library
an empty array is created.
However, when a helper library has to be built, it is not necessary
to include the created static library in an array.
`libmm-test-common` is created using underscores. It also uses
`gio-unix-2.0` as a public dependency but actually it should be
private.
Both issues have been fixed.
meson is a build system focused on speed an ease of use, which
helps speeding up the software development. This patch adds meson
support along autotools.
Iñigo Martínez
Aleksander Morgado