Revert accidental change of osm2pgsql version

diff --git a/osm2pgsql b/osm2pgsql
index 55b6b4302ca0443ba78d9c47cddfd8fc7731be4d..8179cdb67e70d7fb5605ab6ddedfd0bd3347db47 160000 (submodule)
--- a/osm2pgsql
+++ b/osm2pgsql
@@ -1 +1 @@
-Subproject commit 55b6b4302ca0443ba78d9c47cddfd8fc7731be4d
+Subproject commit 8179cdb67e70d7fb5605ab6ddedfd0bd3347db47