[rubygems/rubygems] Improve log message when resolving due to local platform not in lockfile

Current it says "you added a new platform to your gemfile", but that's
not actually the case here.

ruby/rubygems@1e39527a38

Author: deivid-rodriguez

lib/bundler/definition.rb

@@ -625,7 +625,8 @@ def resolution_packages
       @resolution_packages ||= begin
         last_resolve = converge_locked_specs
         remove_invalid_platforms!
-        packages = Resolver::Base.new(source_requirements, expanded_dependencies, last_resolve, @platforms, locked_specs: @originally_locked_specs, unlock: @unlocking_all || @gems_to_unlock, prerelease: gem_version_promoter.pre?, prefer_local: @prefer_local, new_platforms: @new_platforms)
+        new_resolution_platforms = @current_platform_missing ? @new_platforms.append(local_platform) : @new_platforms
+        packages = Resolver::Base.new(source_requirements, expanded_dependencies, last_resolve, @platforms, locked_specs: @originally_locked_specs, unlock: @unlocking_all || @gems_to_unlock, prerelease: gem_version_promoter.pre?, prefer_local: @prefer_local, new_platforms: new_resolution_platforms)
         packages = additional_base_requirements_to_prevent_downgrades(packages)
         packages = additional_base_requirements_to_force_updates(packages)
         packages
@@ -768,7 +769,6 @@ def add_current_platform
       @most_specific_non_local_locked_platform = find_most_specific_locked_platform
       return if @most_specific_non_local_locked_platform
 
-      @new_platforms << local_platform
       @platforms << local_platform
       true
     end

spec/bundler/commands/install_spec.rb

@@ -1369,6 +1369,7 @@ def run
       bundle "install --verbose"
 
       expect(out).to include("re-resolving dependencies because your lockfile does not include the current platform")
+      expect(out).not_to include("you added a new platform to your gemfile")
 
       expect(lockfile).to eq <<~L
         GEM