python3: -dev should depend on distutils

python3: -dev should depend on distutils

python3-config uses distutils:

Traceback (most recent call last):
  File "/usr/bin/python3-config", line 9, in <module>
    from distutils import sysconfig
ModuleNotFoundError: No module named 'distutils'

Add the dependency so that distutils is always present.

[ YOCTO #13592 ]

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>