cgal_create_release_with_cmake.cmake: only call Git one

[lrineau]

Summary of Changes

cgal_create_release_with_cmake.cmake was terribly slow (in particular on Windows). In order to fix that:

• call Git only once, to get the Git hash of the repository, and
• Use $Id: ${f} ${GIT_HASH} $ to replace $Id$ (all files have the same hash).

That is sufficient to identify without any doubt the version is the original file.

@sloriot: do you agree with those changes?

Release Management

• Affected package(s): Scripts

Cc: @janetournois

[lrineau]

On my Linux machine, the difference is:

• 65 seconds before, versus
• 1.2 seconds now.

[sloriot]

Successfully tested in CGAL-6.0-Ic-46 (provided it is used by scripts)