Bug/Patch #1481770: Use .so extension for shared libraries on HP-UX for ia64.

I suppose this could be backported if anyone cares.
diff --git a/Misc/ACKS b/Misc/ACKS
index 2606dff..57b85e5 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -189,6 +189,7 @@
 Stephen D Evans
 Tim Everett
 Paul Everitt
+David Everly
 Greg Ewing
 Martijn Faassen
 Andreas Faerber