{vsn, git} in version tagged (1.2.1) release archive

[adessemond]

In https://github.com/tonyrog/cl/archive/cl-1.2.1.tar.gz (it can also be present in 1.2 as well, I did not check), the file src/cl.app.src has the statement {vsn, git} rather than {vsn, "1.2.1"}. This results in the following error on a compilation attempt:

==> cl-cl-1.2.1 (compile)
Compiled src/clu.erl
Compiled src/cl13.erl
Compiled src/cl12.erl
Compiled src/cl11.erl
Compiled src/cl10.erl
Compiled src/cl.erl
Compiling c_src/cl_nif.c
Compiling c_src/cl_hash.c
ERROR: sh(git describe --always --tags)
failed with return code 128 and the following output:
fatal: Not a git repository (or any parent up to mount point /var/tmp/portage)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).

ERROR: compile failed while processing /var/tmp/portage/dev-libs/erlang-cl-1.2.1/work/cl-cl-1.2.1: rebar_abort

Changing for {vsn, "1.2.1"} fixes the issue.