Never modify sys.path

This removes the logic that, under some circumstances when not
using a version from PyPI, would insert the location of the gitdb
git-submodule near the front of sys.path.

(As noted in gitpython-developers#1717, the specific way this was being done was not
causing the git-submodule's version of gitdb to actually be used.
But it was still modifying sys.path, which this now prevents.)

Author: EliahKagan

git/__init__.py

@@ -7,38 +7,12 @@
 # @PydevCodeAnalysisIgnore
 from git.exc import *  # @NoMove @IgnorePep8
 import inspect
-import os
-import sys
-import os.path as osp
 
 from typing import Optional
 from git.types import PathLike
 
 __version__ = "git"
 
-
-# { Initialization
-def _init_externals() -> None:
-    """Initialize external projects by putting them into the path"""
-    if __version__ == "git" and "PYOXIDIZER" not in os.environ:
-        sys.path.insert(1, osp.join(osp.dirname(__file__), "ext", "gitdb"))
-
-    try:
-        import gitdb
-    except ImportError as e:
-        raise ImportError("'gitdb' could not be found in your PYTHONPATH") from e
-    # END verify import
-
-
-# } END initialization
-
-
-#################
-_init_externals()
-#################
-
-# { Imports
-
 try:
     from git.config import GitConfigParser  # @NoMove @IgnorePep8
     from git.objects import *  # @NoMove @IgnorePep8
@@ -59,8 +33,6 @@ def _init_externals() -> None:
 except GitError as _exc:
     raise ImportError("%s: %s" % (_exc.__class__.__name__, _exc)) from _exc
 
-# } END imports
-
 # __all__ must be statically defined by py.typed support
 # __all__ = [name for name, obj in locals().items() if not (name.startswith("_") or inspect.ismodule(obj))]
 __all__ = [