Get rid of the zipapp_main kludge

bork/cli.py

@@ -128,14 +128,3 @@ def main():
         (log.exception if verbose else log.error)(str(err))
 
         sys.exit(1)
-
-
-def zipapp_main():
-    # If Bork is put in a zipapp, this allows scripts executed as subprocesses
-    # to access pep517.compat.
-    #
-    # The problem area is the `import compat` line in pep517's _in_process.py.
-    # https://github.com/pypa/pep517/blob/master/pep517/_in_process.py
-    os.environ['PYTHONPATH'] = ':'.join([*sys.path, sys.argv[0] + '/pep517'])
-
-    main()

pyproject.toml

@@ -8,7 +8,7 @@ project_name = "Bork"
 
 [tool.bork.zipapp]
 enabled = true
-main = "bork.cli:zipapp_main"
+main = "bork.cli:main"
 
 [tool.bork.release]
 pypi = true