Don't include init-repository and .gitmodules in the package either

Even though qt5.git will not be packaged either.

Change-Id: I9bc02170dde1262aeb839741722d275bdb9e4b46
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

.gitattributes

 .tag                    export-subst
 .gitignore              export-ignore
 .gitattributes          export-ignore
+.gitmodules             export-ignore
 .commit-template        export-ignore
+init-repository         export-ignore