contrib/jenkins: more aggressively exclude docs

Completely discard prefix/share/doc in builds. There was still ~1.2Mb from
libosmo-netif around.

Exception: osmo-hlr installs a bootstrap sql in prefix/share/doc/osmo-hlr,
so leave that script as-is.

Change-Id: I7f3f3cfed0f56099bdff93b11a0009c1caef67c8
diff --git a/contrib/jenkins-build-osmo-bts-sysmo.sh b/contrib/jenkins-build-osmo-bts-sysmo.sh
index b8dc841..9838834 100755
--- a/contrib/jenkins-build-osmo-bts-sysmo.sh
+++ b/contrib/jenkins-build-osmo-bts-sysmo.sh
@@ -80,7 +80,7 @@
 
 # don't package documentation -- the libosmocore docs can be up to 16 Mb large,
 # a significant amount compared to the binaries
-rm -rf "$prefix_real/share/doc/libosmocore"
+rm -rf "$prefix_real/share/doc"
 
 # build the archive that is going to be copied to the tester and then to the BTS
 rm "$base"/*.tgz "$base"/*.md5 || true