Revert "osmo-build-dep.sh: don't build osmo-gsm-manuals"

Now that we have the proper fix of making a clone of
osmo-gsm-manuals.git available before builds start, and not using
'osmo-build-dep.sh osmo-gsm-manuals' in the contrib/jenkins.sh files
anymore, we can remove the temporary solution. This reverts commit
4cbc445616.

Related: OS#4912
Depends: https://gerrit.osmocom.org/q/topic:jenkins-no-manuals-dep
Change-Id: I88d57ee04775dc75e6ca3152d7edfa7f47608c8a

scripts/osmo-build-dep.sh

@@ -54,14 +54,6 @@ if [ -n "$subdir" ]; then
 	cd "$subdir"
 fi
 
-# osmo-gsm-manuals: save time by only cloning the repository (OS#4912).
-# Projects depending on osmo-gsm-manuals can still build the manuals, because
-# we set OSMO_GSM_MANUALS_DIR to the clone destination.
-if [ "$project" = "osmo-gsm-manuals" ]; then
-	echo "WARNING: osmo-gsm-manuals cloned, but skipping build (OS#4912)"
-	exit 0
-fi
-
 autoreconf --install --force
 ./configure --prefix="$inst/stow/$project" --with-systemdsystemunitdir="$inst/stow/$project/lib/systemd/system" $cfg