Revert "Removing absolute path resolution"

This reverts commit 5748645b9c0fe034e5111c617cfd07794b4bf4cd.
Revert "Depend on node scons-tools, do not invoke bin/combine, bin/scan-dependencies."

This reverts commit ba48f284f94890918f6f9b612feec9af4b6f2fdd.
Revert "scan-dependencies and module_combine fixes for cygwin"

This reverts commit deeb4ad001011c1f8e0c025ffd315461e2cde6db.