Scapy-ssl_tls/setup.py copies its layers to:
C:\Python27\Lib\site-packages\python27\lib\site-packages\scapy\layers
when wheel package is installed.
get_layer_files_dst() method returns list of tuples (<folder>, [<files>]), where <folder> is an absolute path. According to distutils documentation it should copy these files where we expect, but it does not work because wheel module does not support absolute paths, and they end up being installed relative to site-packages (more info).
To solve this problem, there should be a relative (to sys.prefix) path returned.