update osm2pgsql (bound COPY buffers)

diff --git a/osm2pgsql b/osm2pgsql
index 90e17f0e8c793487ca39cbf95501cd9c5daa33e2..8d9087f1111f4a062158e8e6b10bfbceed90899b 160000 (submodule)
--- a/osm2pgsql
+++ b/osm2pgsql
@@ -1 +1 @@
-Subproject commit 90e17f0e8c793487ca39cbf95501cd9c5daa33e2
+Subproject commit 8d9087f1111f4a062158e8e6b10bfbceed90899b