Change header installation now that we are using pip

python/dist/BUILD.bazel

@@ -225,7 +225,6 @@ pkg_tar(
         ":generated_wkt_compiler",
         "setup.py",
         ":utf8_range_source_files",
-        "MANIFEST.in",
         "//:LICENSE",
         "//:upb_source_files",
         "//upb/util:util_source_files",

python/dist/MANIFEST.in

@@ -1,4 +0,0 @@
-include python/*.h
-include upb/*.h
-include upb/**/*.h
-include utf8_range/*.h

python/dist/setup.py

@@ -82,5 +82,4 @@ setup(
     install_requires=[],
     ext_modules= [Extension('google._upb._message', glob.glob('google/protobuf/*.c') + glob.glob('python/*.c') + glob.glob('upb/*.c') + glob.glob('upb/**/*.c') + glob.glob('utf8_range/*.c'), include_dirs=[current_dir, os.path.join(current_dir, 'utf8_range')])],
     python_requires='>=3.7',
-    headers = ['python/*.h', 'upb/*.h', 'upb/**/*.h', 'utf8_range/*.h', 'google/protobuf/*.h'],
 )