update to latest osm2pgsql

Important changes:

* fix disabling of JIT in Postgresql
* support for finding latests Postgresql from their repos
* no longer create nodes table with flatnodes

diff --git a/osm2pgsql b/osm2pgsql
index acbec68bbf94dafae103663801d55291cf8f227e..94a5060353179f4cf3e92aa622a2aa5d1afa6fee 160000 (submodule)
--- a/osm2pgsql
+++ b/osm2pgsql
@@ -1 +1 @@
-Subproject commit acbec68bbf94dafae103663801d55291cf8f227e
+Subproject commit 94a5060353179f4cf3e92aa622a2aa5d1afa6fee