Remove unused function get_current_dir() from setup.py.

setup.py

@@ -28,7 +28,6 @@
 from __future__ import absolute_import
 from __future__ import print_function
 
-import inspect
 import os
 
 ## Upgrade setuptools to a version which supports Python 2 and 3
@@ -47,10 +46,6 @@ __author__ = "Isis Agora Lovecruft"
 __contact__ = 'isis@patternsinthevoid.net'
 __url__ = 'https://github.com/isislovecruft/python-gnupg'
 
-def get_current_dir():
-    """Current dir of this file, regardless of where we're called from."""
-    here = inspect.getabsfile(inspect.currentframe()).rsplit(os.path.sep, 1)[0]
-    return here
 
 def get_deps_reqs():
     """Get dependencies from the pip requirements.txt file."""