git-hook: Catch tab indentation also for makefiles

[Stephan Bergmann]

On 09/04/2017 03:30 PM, Tamas Zolnai wrote:
> I just noticed that for makefiles (*.mk) git does not check whether the commit contains tab indentation. As I know we use spaces also for makefiles for indentation, right? So I added a patch changing pre-commit hook to check tab also for makfiles:
> https://gerrit.libreoffice.org/#/c/41897/
> I hope it's ok. I don't know who used to care of git stuff.

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).