Only install Windows 2.7 support for 2.7

Author: nedbat

.github/workflows/testsuite.yml

@@ -38,8 +38,8 @@ jobs:
         with:
           python-version: "${{ matrix.python-version }}"
 
-      - name: "Install Visual C++ for Python 2.7"
-        if: runner.os == 'Windows'
+      - name: "Install Visual C++ if needed"
+        if: runner.os == 'Windows' && matrix.python-version == '2.7'
         run: |
           choco install vcpython27 -f -y