ion-c: move to v1.0.6

diff --git a/ion-c b/ion-c
index fcbfeaed29a39de03efdc3d2bc825a425312ecf7..98e8043b58e310d3ca03928956c7ea6caed02c69 160000 (submodule)
--- a/ion-c
+++ b/ion-c
@@ -1 +1 @@
-Subproject commit fcbfeaed29a39de03efdc3d2bc825a425312ecf7
+Subproject commit 98e8043b58e310d3ca03928956c7ea6caed02c69