php: inherit pythonnative

* fixes:
| AUTOV is 1.12
| Traceback (most recent call last):
|   File "/OE/shr-core/openembedded-core/scripts/cp-noerror", line 8, in <module>
|     import shutil
|   File "/usr/lib/python2.7/shutil.py", line 12, in <module>
|     import collections
|   File "/usr/lib/python2.7/collections.py", line 9, in <module>
|     from operator import itemgetter as _itemgetter
| ImportError: /usr/lib/python2.7/lib-dynload/operator.so: undefined symbol: _PyUnicodeUCS4_AsDefaultEncodedString
| ERROR: Function failed: do_configure (see /OE/shr-core/tmp-eglibc/work/x86_64-linux/php-native-5.3.6-r1.0/temp/log.do_configure.14841 for further information)

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>