Use subdir-objects (compile a/b.c to a/b.lo, not ./b.lo)
Use subdir-objects (compile a/b.c to a/b.lo, not ./b.lo)

Automake 2 will make this the default, and 1.14 warns about not
using it. Equivalent to MC commit 1f11065.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=70045
Reviewed-by: Guillaume Desmottes <f16649c7afcd84e3350287183c4ed23cb1aea57c@collabora.co.uk>

freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut,freedesktop-unofficial-mirror/telepathy__telepathy-salut