Create directory for libs on Mac if nonexistent (needed if installing into a prefix)
Use uname -s which works everywhere
Do not embed external dependencies in source tree
Install file and ssdeep with deps.sh
Pass prefix to setup.py
Merge branch 'mac-uname-fix'
Merge branch 'respect-prefix'

Conflicts:
	Makefile.in
Merge branch 'remove-external-dependencies'