This reverts commit 69985bb1.

classic/5.0/src/ and src/ whenever the repository changes. This helps to
reproduce simulation data since the git revision string is written to the
stat file as well as the H5 file. Sofar this string has been updated only
when one runs cmake. This causes a mismatch between the logged git
revision and the revision that corresponds to the binary that produced
the data.

To facilitate your local install and future improvements of the hooks
consider applying the script hooks/create-hook-symlink.sh.