[PATH] * trampvar.el.in (tramp-repository-branch, tramp-repository-version): Avoid to call git for initializing the variables

[Lin Sun]

Hi,
The tramp is extremely slow on windows, and I found that tramp in
emacs will call git 4 times on startup.

In the emacs-release package, the `tramp-loaddefs.el` has the copy of
tramp-repository-branch, tramp-repository-version (these two variables
are marked as autoload), it will call git to initialize their values;
and when requiring the `trampvar.el`, these two variables will be
initialize with calling git again.  That will call git 4 times.

This patch tries to avoid these calls, improving the performance a lot.

Please help review the patch. Thanks.

Lin

0001-trampvar.el.in-tramp-repository-branch-tramp-reposit.patch
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