Remove MSVC tests and document that source is just for ubuntu/macos

.github/workflows/source_distribution_tests.yml

@@ -54,10 +54,6 @@ jobs:
           - { os: ubuntu-20.04, python-version: "3.10", architecture: x64 }
           - { os: macos-11, python-version: "3.7", architecture: x64 }
           - { os: macos-12, python-version: "3.10", architecture: x64 }
-          - { os: windows-2019, python-version: "3.7", architecture: x86 }
-          - { os: windows-2019, python-version: "3.10", architecture: x86 }
-          - { os: windows-2019, python-version: "3.7", architecture: x64 }
-          - { os: windows-2019, python-version: "3.10", architecture: x64 }
     runs-on: ${{ matrix.os }}
     defaults:
       run:

python/dist/BUILD.bazel

@@ -217,6 +217,8 @@ pkg_files(
     prefix = "utf8_range",
 )
 
+# NOTE: This package currently only works for macos and ubuntu, MSVC users
+# should use a binary wheel.
 pkg_tar(
     name = "source_wheel",
     extension = "tar.gz",