update osm2pgsql

Fixes #770.

diff --git a/osm2pgsql b/osm2pgsql
index c27acf17055ebe22c6363c293385865c624207f8..00fb2505c1548a7403ce01f69e891447124235c3 160000 (submodule)
--- a/osm2pgsql
+++ b/osm2pgsql
@@ -1 +1 @@
-Subproject commit c27acf17055ebe22c6363c293385865c624207f8
+Subproject commit 00fb2505c1548a7403ce01f69e891447124235c3