Match ABI versions precisely

"3.2.0+33" starts with "3.2.0+3", but it doesn't mean that they are the
same ABI version.

tool/outdate-bundled-gems.rb

@@ -109,20 +109,21 @@ curdir.glob(".bundle/{extensions,.timestamp}/*/") do |dir|
   end
 end
 
-version = RbConfig::CONFIG['ruby_version']
+baseruby_version = RbConfig::CONFIG['ruby_version'] # This may not have "-static"
 curdir.glob(".bundle/{extensions,.timestamp}/#{platform}/*/") do |dir|
-  unless File.basename(dir).start_with?(version)
+  version = File.basename(dir).split('-', 2).first # Remove "-static" if exists
+  unless version == baseruby_version
     curdir.rmdir(dir)
   end
 end
 
-curdir.glob(".bundle/extensions/#{platform}/#{version}/*/") do |dir|
+curdir.glob(".bundle/extensions/#{platform}/#{baseruby_version}/*/") do |dir|
   unless curdir.exist?(".bundle/specifications/#{File.basename(dir)}.gemspec")
     curdir.rmdir(dir)
   end
 end
 
-curdir.glob(".bundle/.timestamp/#{platform}/#{version}/.*.time") do |stamp|
+curdir.glob(".bundle/.timestamp/#{platform}/#{baseruby_version}/.*.time") do |stamp|
   unless curdir.directory?(File.join(".bundle", stamp[%r[/\.([^/]+)\.time\z], 1].gsub('.-.', '/')))
     curdir.unlink(stamp)
   end