python-native: configure unicode to ucs4

python-native: configure unicode to ucs4

* while trying to run gdb from an SDK created by OE, I got the following
errors: /usr/local/angstrom/arm/bin/arm-angstrom-linux-gnueabi-gdb: undefined symbol:
PyUnicodeUCS2_FromEncodedObject

* the reason is that the workstation (ubuntu 10.04 or 9.01)'s Python is compiled using ucs4
and the python-native used to create arm-angstrom-linux-gnueabi-gdb is using ucs2, the
problem is detailed here :
http://docs.python.org/faq/extending#when-importing-module-x-why-do-i-get-undefined-symbol-pyunicodeucs2

* configuring python-native with ucs=4 solves this problem.

Signed-off-by: Eric Bénard <eric@eukrea.com>
Acked-by: Khem Raj <raj.khem@gmail.com>