sip: Update to 4.14.2.

The sip configure.py script now has some support for cross compiling. This
allowed simplication of the existing OpenEmbedded sip support. The sip
recipe now produces support for builds via sip-native and target runtime
via sip.

This has been build and runtime tested on the zedboard and ettus-e300.

Signed-off-by: Philip Balister <philip@balister.org>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>