Remove duplicated newline in shebang of windows launcher (#221)

distlib/scripts.py

@@ -177,7 +177,7 @@ def _build_shebang(self, executable, post_interp):
         else:
             result = b'#!/bin/sh\n'
             result += b"'''exec' " + executable + post_interp + b' "$0" "$@"\n'
-            result += b"' '''"
+            result += b"' '''\n"
         return result
 
     def _get_shebang(self, encoding, post_interp=b'', options=None):
@@ -258,9 +258,6 @@ def get_manifest(self, exename):
 
     def _write_script(self, names, shebang, script_bytes, filenames, ext):
         use_launcher = self.add_launchers and self._is_nt
-        linesep = os.linesep.encode('utf-8')
-        if not shebang.endswith(linesep):
-            shebang += linesep
         if not use_launcher:
             script_bytes = shebang + script_bytes
         else:  # pragma: no cover