Allow installing generated pdfs with 'make install' in all Osmocom
projects using osmo-gsm-manuals. This makes proper debian packaging of
the manuals easier.
Autotools will automatically run this file's install target, when
running 'make install' in the top source dir. Do not install anything,
when OSMO_GSM_MANUALS_NO_INSTALL is set, and set this variable for the
tests dir, so we don't install the test pdfs.
Related: OS#3899
Change-Id: I66f33172fa410681acbaef4592e9405627948705
Oliver Smith
5501ba607b