Andrey Borzenkov 396311f0f6 consolidate grub_util_exec code
We need to hide "modprobe efivars" error output to avoid confusion. So
consolidate grub_util_exec_* into single function that can optionally redirect
all three standard descriptors and make all other functions compatibility
wrappers.

Also remove include/grub/osdep/exec_unix.h which does not appear to be used
anywhere.
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