The 'export_packages' field in the generate_gir() command should
include the name of the pkg-config package being exported, not the
name of the library file.
Without this change, building GIR files depending on the one we
provide here would fail as the corresponding .pc file isn't found.
The generated objects in `libmm-glib` are include in
`libmm_glib_dep` one by one to avoid the link to the generated
library that is included as a whole in `libmm-glib`.
meson includes a way to include partial objects of a dependency by
using the `partial_dependency` method, so by taking advantage of it
almost all objects are included.
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.
