Filename expansion support for wildcards in GRUB script.

	Filename expansion support for wildcards in GRUB script.

	* tests/grub_script_expansion.in: New test.
	* Makefile.util.def: Rule for new test.

	* grub-core/commands/wildcard.c: New file, implements filename
	expansion support for GRUB script.
	* grub-core/Makefile.core.def: Rule update for regexp.mod.
	* grub-core/script/argv.c: Cosmetic changes.
	* grub-core/script/execute.c (grub_script_arglist_to_argv):
	Refactored to perform wildcard expansion on arguments.
	* include/grub/script_sh.h (grub_script_wildcard_translator): New
	struct.

	* tests/util/grub-shell.in: Fix quoting for read input.