scons: Switch to standalone version, update to 3.1.2
* Install the standalone (scons-local) version
Advantages:
- The regular version of SCons requires distutils during installation;
the standalone version does not have this requirement
Disadvantages:
- The scons-local package is not available from the Fossies mirror
- The patch will need to be manually updated with each version update
* Install files to $(STAGING_DIR_HOSTPKG) instead of $(STAGING_DIR_HOST)
* Write the correct shebang into scripts instead of using the wrapper
* Update to 3.1.2
Signed-off-by: Jeffery To <jeffery.to@gmail.com>