Install gperf for mingw as well

Author: st0012

.github/workflows/test.yml

@@ -46,6 +46,6 @@ jobs:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # 'bundle install' and cache
     - run: choco install gperf
-      if: ${{ matrix.ruby == 'mswin' }}
+      if: ${{ matrix.ruby == 'mswin' || matrix.ruby == 'mingw' }}
     - name: Run test
       run: bundle exec rake compile test