Commit
bc474e742edc5930601f75db0f18cb5b21cb8bb9
by Oliver Smithtestenv: osmo-dev: build with gtp_linux.opts
Run the osmo-ggsn ./configure with --enable-gtp-linux, in preparation
for testing kernel gtp-u with testenv too.
Related: https://gitea.osmocom.org/osmocom/osmo-dev/src/branch/master/gtp_linux.opts
Change-Id: Ia8ea5494597e0fedae93f501c8bc7d6115543f36