Upgrade to Ruby 2.4.0 (r55513).

ruby-2.3.0-ruby_version.patch

@@ -20,7 +20,7 @@ diff --git a/configure.in b/configure.in
 index db37cd6..6e73fae 100644
 --- a/configure.in
 +++ b/configure.in
-@@ -4300,9 +4300,6 @@ AS_CASE(["$target_os"],
+@@ -4301,9 +4301,6 @@ AS_CASE(["$target_os"],
      rubyw_install_name='$(RUBYW_INSTALL_NAME)'
      ])
  
@@ -30,7 +30,7 @@ index db37cd6..6e73fae 100644
  rubyarchprefix=${multiarch+'${archlibdir}/${RUBY_BASE_NAME}'}${multiarch-'${rubylibprefix}/${arch}'}
  AC_ARG_WITH(rubyarchprefix,
  	    AS_HELP_STRING([--with-rubyarchprefix=DIR],
-@@ -4325,56 +4322,62 @@ AC_ARG_WITH(ridir,
+@@ -4326,56 +4323,62 @@ AC_ARG_WITH(ridir,
  AC_SUBST(ridir)
  AC_SUBST(RI_BASE_NAME)
  
@@ -120,7 +120,7 @@ index db37cd6..6e73fae 100644
  
  if test "${LOAD_RELATIVE+set}"; then
      AC_DEFINE_UNQUOTED(LOAD_RELATIVE, $LOAD_RELATIVE)
-@@ -4391,6 +4394,7 @@ AC_SUBST(sitearchincludedir)dnl
+@@ -4392,6 +4395,7 @@ AC_SUBST(sitearchincludedir)dnl
  AC_SUBST(arch)dnl
  AC_SUBST(sitearch)dnl
  AC_SUBST(ruby_version)dnl
@@ -240,7 +240,7 @@ index 55ca080..75eea2b 100644
 +              RbConfig::CONFIG['ruby_version_dir_name'] || RbConfig::CONFIG['ruby_version']
    end
  
- end
+   ##
 diff --git a/test/rubygems/test_gem.rb b/test/rubygems/test_gem.rb
 index 0428bea..b6e090e 100644
 --- a/test/rubygems/test_gem.rb