meson: Fix install-quiet after clean

meson: Fix install-quiet after clean

libpq-oauth was missing from the installed_targets list, so

    $ ninja clean && ninja install-quiet

failed with the error message

    ERROR: File 'src/interfaces/libpq-oauth/libpq-oauth.a' could not be found

It seems a little odd to have to tell Meson what's missing, since it
clearly knows how to build that file during regular installation. But
the "quiet" variant we've created must use --no-rebuild, to avoid
spawning concurrent ninja processes that would step on each other.

Reported-by: Andres Freund <andres@anarazel.de>
Backpatch-through: 18
Discussion: https://postgr.es/m/hbpqdwxkfnqijaxzgdpvdtp57s7gwxa5d6sbxswovjrournlk6%404jnb2gzan4em