Include a test involving consecutive backslashes followed by a non-escaped

Include a test involving consecutive backslashes followed by a non-escaped

Sat Jul 31 20:33:07 2004  Matthias Clasen  <maclas@gmx.de>

	* tests/shell-test.c: Include a test involving consecutive
	backslashes followed by a non-escaped doublequote.

	* glib/gshell.c (tokenize_command_line): Count consecutive
	backslashes mod 2 to detect escaped doubleqotes.  (#127306)