Update scripts/Makefile.fwinst to cope with older make
David Woodhouse authored

Also fix unwanted rebuilds of the firmware/ihex2fw tool by including
the .ihex2fw.cmd file when present.
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Reported-and-tested-by: default avatarWang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
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