Use $(SHELL) when running move-if-change

[Nick Clifton]

Hi Ben,

>>Please.  I find the output valuable when I'm trying to see what was
>>rebuilt (and the silencing valuable for make -s, too).
> 
> 
> Yes, agreed.  Okay to commit to src/move-if-change, dear maintainers?

As Ian said - this patch (new version or old, but new version preferred) 
is approved provided that it is also approved for gcc and checked in at 
the same time.

Cheers
   Nick