scons: probe "python" and "python2" first in pywrap.sh in order to use the users preferred version if possible

SVN-Revision: 31743

SVN-Revision: 31742

tools/scons: remove the python 3 compat patch, it is incomplete and breaks with python 2.5.2. i guess scons with python 3 is a lost cause...

SVN-Revision: 31741

SVN-Revision: 31624

scons: override the platform instead of using the host one - fixes build issues on non-linux systems

SVN-Revision: 31620

This makes it more possible to build scons based applications
for openwrt.

SVN-Revision: 31618