Don't use "maintainer mode"
Don't use "maintainer mode"

Using AM_MAINTAINER_MODE causes builds that didn't use
--enable-maintainer-mode to omit dependencies for the build system, which
in practice is really annoying.

Also, the GNOME macro now explicitly disables single includes, in a way
that clashes with *us* disabling single includes and means that using
--enable-maintainer-mode causes multiple-definition warnings.

Since we warn (fatally, during development) on deprecated symbols *anyway*,
we don't seem to be gaining anything from GNOME_MAINTAINER_MODE_DEFINES.

freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger,freedesktop-unofficial-mirror/telepathy__telepathy-logger