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/NEWS b/Misc/NEWS
index 679bd30..4f9083c 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -81,6 +81,8 @@
 Build
 -----
 
+- Bug/Patch #1481770: Use .so extension for shared libraries on HP-UX for ia64.
+
 - Patch #1471883: Add --enable-universalsdk.
 
 C API