[Win32] Add SCons support for building /resource

[Win32] Add SCons support for building /resource

* Enable use of MSYS2 as the build host and build target.
* Add MSYS2 specific SCons files.
* Modify existing SCons files to support building /resource
  directory from within MSYS2.

Change-Id: I95f4d205f106782c0dc487209fbb5c137aa3d7ac
Signed-off-by: Daniel Ferguson <daniel.j.ferguson@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/5505
Reviewed-by: David Antler <david.a.antler@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>