tweaks the executable that comes with persepolis to work better with
gentoo's python-exec.

by default meson will detect the python executable used to run it, then
replace @PYTHON@ with that path to be used at runtime. this doesn't work
with portage's path abstraction. instead this replaces with a generic path
then relies on 'python_newscript', run in the ebuild, to resolve the
correct path.

also remove's the hard-coded 'pythonsitepackagedir', python-exec will set
the system path correctly at runtime.

diff --git a/persepolis/persepolis.py b/persepolis/persepolis.py
index d5e5b25..67bc72b 100644
--- a/persepolis/persepolis.py
+++ b/persepolis/persepolis.py
@@ -1,4 +1,4 @@
-#!@PYTHON@
+#!/usr/bin/python
 
 
 # -*- coding: utf-8 -*-
@@ -19,9 +19,6 @@
 # this file is created for running persepolis from /usr/bin/ or /usr/local/bin/.
 import sys
 
-pythonsitepackagedir = '@pythonsitepackagedir@'
-
 if __name__ == '__main__':
-    sys.path.append(pythonsitepackagedir)
     from persepolis.scripts import persepolis
     persepolis.main()