Makefile: Fix for older versions of git
Makefile: Fix for older versions of git

Older versions of git don't support -C. Change to the directory
explicitly instead.

Closes #4407
Reviewed-by: Stef Walter <8a7fbf0f15d3ad982af54ef28f5c117d2494b76c@redhat.com>

harishanand95/cockpit,larsu/cockpit,garrett/cockpit,arilivigni/cockpit,garrett/cockpit,SotolitoLabs/cockpit,xhad/cockpit,SotolitoLabs/cockpit,deryni/cockpit,michalskrivanek/cockpit,cockpit-project/cockpit,xhad/cockpit,cockpituous/cockpit,larsu/cockpit,deryni/cockpit,sgallagher/cockpit,harishanand95/cockpit,cockpituous/cockpit,martinpitt/cockpit,mvollmer/cockpit,garrett/cockpit,moraleslazaro/cockpit,arilivigni/cockpit,xhad/cockpit,SotolitoLabs/cockpit,moraleslazaro/cockpit,michalskrivanek/cockpit,mvollmer/cockpit,garrett/cockpit,andreasn/cockpit,andreasn/cockpit,larsu/cockpit,cockpit-project/cockpit,moraleslazaro/cockpit,dperpeet/cockpit,arilivigni/cockpit,cockpituous/cockpit,xhad/cockpit,sgallagher/cockpit,Scribery/cockpit,andreasn/cockpit,mareklibra/cockpit,garrett/cockpit,michalskrivanek/cockpit,deryni/cockpit,andreasn/cockpit,michalskrivanek/cockpit,andreasn/cockpit,petervo/cockpit,petervo/cockpit,SotolitoLabs/cockpit,harishanand95/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,harishanand95/cockpit,larskarlitski/cockpit,cockpit-project/cockpit,michalskrivanek/cockpit,sgallagher/cockpit,larsu/cockpit,mvollmer/cockpit,Scribery/cockpit,vanloswang/cockpit,vanloswang/cockpit,petervo/cockpit,dperpeet/cockpit,petervo/cockpit,SotolitoLabs/cockpit,andreasn/cockpit,Scribery/cockpit,xhad/cockpit,sgallagher/cockpit,Scribery/cockpit,arilivigni/cockpit,xhad/cockpit,dperpeet/cockpit,Scribery/cockpit,martinpitt/cockpit,stefwalter/cockpit,vanloswang/cockpit,arilivigni/cockpit,SotolitoLabs/cockpit,petervo/cockpit,arilivigni/cockpit,martinpitt/cockpit,stefwalter/cockpit,larskarlitski/cockpit,deryni/cockpit,larskarlitski/cockpit,larskarlitski/cockpit,mareklibra/cockpit,deryni/cockpit,vanloswang/cockpit,petervo/cockpit,stefwalter/cockpit,moraleslazaro/cockpit,dperpeet/cockpit,xhad/cockpit,deryni/cockpit,vanloswang/cockpit,larskarlitski/cockpit,mareklibra/cockpit,Scribery/cockpit,deryni/cockpit,sgallagher/cockpit,cockpituous/cockpit,mvollmer/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,petervo/cockpit,harishanand95/cockpit,mareklibra/cockpit,vanloswang/cockpit,stefwalter/cockpit,stefwalter/cockpit,andreasn/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,dperpeet/cockpit,stefwalter/cockpit,mareklibra/cockpit,vanloswang/cockpit,cockpituous/cockpit,martinpitt/cockpit,larskarlitski/cockpit,Scribery/cockpit,sgallagher/cockpit,sgallagher/cockpit,cockpit-project/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,larsu/cockpit,harishanand95/cockpit,michalskrivanek/cockpit,larsu/cockpit,mareklibra/cockpit,cockpit-project/cockpit,dperpeet/cockpit,larskarlitski/cockpit,mvollmer/cockpit,arilivigni/cockpit,dperpeet/cockpit,martinpitt/cockpit