[ruby/open3] Removed to load jit_support.rb

It's removed at https://github.com/ruby/open3/commit/4445b9e2a2dd

https://github.com/ruby/open3/commit/41b180deab

test/lib/jit_support.rb

@@ -1,25 +0,0 @@
-require 'rbconfig'
-
-module JITSupport
-  module_function
-
-  def yjit_supported?
-    return @yjit_supported if defined?(@yjit_supported)
-    # nil in mswin
-    @yjit_supported = ![nil, 'no'].include?(RbConfig::CONFIG['YJIT_SUPPORT'])
-  end
-
-  def yjit_force_enabled?
-    "#{RbConfig::CONFIG['CFLAGS']} #{RbConfig::CONFIG['CPPFLAGS']}".match?(/(\A|\s)-D ?YJIT_FORCE_ENABLE\b/)
-  end
-
-  def rjit_supported?
-    return @rjit_supported if defined?(@rjit_supported)
-    # nil in mswin
-    @rjit_supported = ![nil, 'no'].include?(RbConfig::CONFIG['RJIT_SUPPORT'])
-  end
-
-  def rjit_force_enabled?
-    "#{RbConfig::CONFIG['CFLAGS']} #{RbConfig::CONFIG['CPPFLAGS']}".match?(/(\A|\s)-D ?RJIT_FORCE_ENABLE\b/)
-  end
-end