[Releasing] Remove "branch" lines from .gitmodules in qt5.git prior to tagging

[Thiago Macieira]

Em sábado, 24 de dezembro de 2016, às 11:04:23 BRST, Thiago Macieira escreveu:
> Em sábado, 24 de dezembro de 2016, às 12:36:57 BRST, Simon Hausmann 
escreveu:
> > Hmm, the CI interprets these lines. Do you know of any other tool using
> > them?
> 
> git submodule

Some user in interest@ had a problem after checking the v5.7.1 tag out;

===
git checkout tags/v5.7.1
perl init-repository

But it failed with the error "fatal: Remote branch 5.7.1 not found in upstream 
origin”
===

Since the branch gets deleted, the contents of the .gitmodule file are wrong. 
I've found that git submodule accepts "." as the branch name to mean "the same 
branch as this repository", which will also help us by not having to update 
that file every time.

	https://codereview.qt-project.org/180826

I have not tested to see what happens if you're in no branch. It might fall 
back to the linked commit if it can't find a branch. I'll test later.

I have not tested init-repository. I don't use it, so I don't care. git 
submodule is enough.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center