test: more exact test for patch file presence

to better handle releases without patches

Author: flavorjones

bin/test-gem-file-contents

@@ -123,7 +123,7 @@ describe File.basename(gemfile) do
     end
 
     it "contains the patch files" do
-      assert_operator(gemfile_contents.grep(%r{^patches/}).length, :>, 0)
+      assert_equal(Dir.glob("patches/*.patch").length, gemfile_contents.count { |f| File.fnmatch?("patches/*", f) })
     end
 
     it "sets metadata for msys2" do