git-hook: Catch tab indentation also for makefiles

[jani libreoffice]

>> I think temporary GNU make still needs recipe lines to start with tab characters?  And in any case, our makefiles are apparently written with lots of tab characters all over the place.  I'd suggest to revert (at least for now).
> 
> Yeah, I see that tabs and spaces are mixed in makefiles. That's why I thought it would be good to make it consistent similar to other source files.
> I did not push it yet. It's on gerrit. So I can abandon it.

build breaks on my mac when I replace tab with spaces, so please do not make this a demand.

rgds
jan o
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