[ruby/reline] Treat C-Space as M-Space on Windows

https://github.com/ruby/reline/commit/69beca2863

lib/reline/windows.rb

@@ -185,6 +185,10 @@ class Reline::Windows
       # It's treated as Meta+Enter on Windows.
       @@output_buf.push("\e".ord)
       @@output_buf.push(char_code)
+    elsif char_code == 0x20 and control_key_state.anybits?(LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)
+      # It's treated as Meta+Space on Windows.
+      @@output_buf.push("\e".ord)
+      @@output_buf.push(char_code)
     elsif control_key_state.anybits?(LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED)
       @@output_buf.push("\e".ord)
       @@output_buf.concat(char.bytes)