2010-10-11  Grégoire Sutre  <gregoire.sutre@gmail.com>

	Make mktemp invocations portable.

	* grub-core/genmod.sh.in: Use mktemp with an explicit template, and
	exit if mktemp fails.
	* tests/grub_script_blockarg.in: Likewise.
	* tests/partmap_test.in: Likewise.
	* tests/util/grub-shell-tester.in: Likewise.
	* tests/util/grub-shell.in: Likewise.
	* util/powerpc/ieee1275/grub-mkrescue.in: Likewise.
	* Makefile.am: Likewise, and chain shell commands with `&&'
	instead of ';'.
	* util/grub-mkrescue.in: Use the same explicit template as above, and
	exit if mktemp fails.