setupbase.py: Remove duplication of package_data

MANIFEST.in

@@ -4,7 +4,6 b' include LICENSE'
 include setupbase.py
 include _build_meta.py
 include MANIFEST.in
-include py.typed
 include .mailmap
 include .flake8
 include .pre-commit-config.yaml

pyproject.toml

@@ -188,7 +188,6 b' pythonPlatform="All"'
 zip-safe = false
 platforms = ["Linux", "Mac OSX", "Windows"]
 license-files = ["LICENSE"]
-include-package-data = false
 
 [tool.setuptools.packages.find]
 exclude = ["setupext"]

setupbase.py

@@ -89,26 +89,9 b' def find_packages():'
     return packages
 
 #---------------------------------------------------------------------------
-# Find package data
+# Check package data
 #---------------------------------------------------------------------------
 
-def find_package_data():
-    """
-    Find IPython's package_data.
-    """
-    # This is not enough for these things to appear in an sdist.
-    # We need to muck with the MANIFEST to get this to work
-
-    package_data = {
-        'IPython.core' : ['profile/README*'],
-        'IPython.core.tests' : ['*.png', '*.jpg', 'daft_extension/*.py'],
-        'IPython.lib.tests' : ['*.wav'],
-        'IPython.testing.plugin' : ['*.txt'],
-    }
-
-    return package_data
-
-
 def check_package_data(package_data):
     """verify that package_data globs make sense"""
     print("checking package data")