Omit some tests on Ruby 2.4 on Windows

Ruby 2.4 on Windows has some bugs about path processing.

Author: aycabta

test/rdoc/support/test_case.rb

@@ -213,4 +213,11 @@ def verbose_capture_output
       end
     end
   end
+
+  # TODO remove after 2.4 EOL
+  def omit_on_ruby24_on_windows
+    if RUBY_VERSION < "2.5" and RUBY_PLATFORM.downcase =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/
+      omit "Path processing in 2.4 has some bugs."
+    end
+  end
 end

test/rdoc/test_rdoc_options.rb

@@ -90,6 +90,7 @@ class << coder; alias add []=; end
   end
 
   def test_encode_with_trim_paths
+    omit_on_ruby24_on_windows # TODO remove after 2.4 EOL
     subdir = nil
     coder = {}
     class << coder; alias add []=; end
@@ -484,6 +485,7 @@ def test_parse_markup
   end
 
   def test_parse_page_dir
+    omit_on_ruby24_on_windows # TODO remove after 2.4 EOL
     assert_nil @options.page_dir
 
     out, err = capture_output do
@@ -627,6 +629,7 @@ def test_parse_visibility
   end
 
   def test_parse_write_options
+    omit_on_ruby24_on_windows # TODO remove after 2.4 EOL
     tmpdir = File.join Dir.tmpdir, "test_rdoc_options_#{$$}"
     FileUtils.mkdir_p tmpdir
 

test/rdoc/test_rdoc_rdoc.rb

@@ -182,6 +182,7 @@ def test_normalized_file_list_non_file_directory
   end
 
   def test_normalized_file_list_with_dot_doc
+    omit_on_ruby24_on_windows # TODO remove after 2.4 EOL
     expected_files = []
     files = temp_dir do |dir|
       a = File.expand_path('a.rb')
@@ -209,6 +210,7 @@ def test_normalized_file_list_with_dot_doc
   end
 
   def test_normalized_file_list_with_dot_doc_overridden_by_exclude_option
+    omit_on_ruby24_on_windows # TODO remove after 2.4 EOL
     expected_files = []
     files = temp_dir do |dir|
       a = File.expand_path('a.rb')