Revert MatchPlatform#platforms_match?

Because some examples are failed:

    rspec ./spec/cache/gems_spec.rb:236 # bundle cache when previously cached doesn't remove gems that are for another platform
    rspec ./spec/commands/install_spec.rb:220 # bundle install with gem sources the simple case with a gem that installs multiple platforms installs gems for the local platform as first choice
    rspec ./spec/commands/update_spec.rb:39 # bundle update with --all updates the entire bundle
    rspec ./spec/commands/update_spec.rb:49 # bundle update with --all doesn't delete the Gemfile.lock file if something goes wrong
    rspec ./spec/commands/update_spec.rb:104 # bundle update with a top level dependency unlocks all child dependencies that are unrelated to other locked dependencies
    rspec ./spec/commands/update_spec.rb:115 # bundle update with an unknown dependency should inform the user
    rspec ./spec/commands/update_spec.rb:119 # bundle update with an unknown dependency should suggest alternatives
    rspec ./spec/commands/update_spec.rb:126 # bundle update with a child dependency should update the child dependency
    rspec ./spec/commands/update_spec.rb:299 # bundle update in a frozen bundle should suggest different command when frozen is set globally
    rspec ./spec/runtime/platform_spec.rb:60 # Bundler.setup with multi platform stuff will add the resolve for the current platform

1 files changed, 8 insertions, 6 deletions

diff --git a/spec/install/gems/resolving_spec.rb b/spec/install/gems/resolving_spec.rb
index 1c7554700a..2f46661058 100644
--- a/spec/install/gems/resolving_spec.rb
+++ b/spec/install/gems/resolving_spec.rb
@@ -150,17 +150,19 @@ RSpec.describe "bundle install with install-time dependencies" do
             s.required_ruby_version = "> 9000"
           end
           build_gem "rack", "1.2" do |s|
-            s.platform = Bundler.local_platform
+            s.platform = mingw
             s.required_ruby_version = "> 9000"
           end
           build_gem "rack", "1.2"
         end
 
-        install_gemfile <<-G, :artifice => "compact_index_rate_limited", :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
-          ruby "#{RUBY_VERSION}"
-          source "http://localgemserver.test/"
-          gem 'rack'
-        G
+        simulate_platform mingw do
+          install_gemfile <<-G, :artifice => "compact_index_rate_limited", :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+            ruby "#{RUBY_VERSION}"
+            source "http://localgemserver.test/"
+            gem 'rack'
+          G
+        end
 
         expect(out).to_not include("rack-9001.0.0 requires ruby version > 9000")
         expect(out).to_not include("rack-1.2-#{Bundler.local_platform} requires ruby version > 9000")