Makefile: remove $(GIT_VERSION) from $(SCRIPT_DEFINES)

Remove the $(GIT_VERSION) from $(SCRIPT_DEFINES). Now every time HEAD changes in a development copy we don't need to re-build the scripts and script libraries. This has not been needed since 2b9391bc675 (Makefile: do not replace @@GIT_VERSION@@ in shell scripts, 2012-06-20). On my setup this changes the re-making of 44 targets in a development copy where moved HEAD to 27. The $(GIT_VERSION) was seemingly left here by mistake or omission. We didn't need it since 2b9391bc675, but in the later e4dd89ab984 (Makefile: update scripts when build-time parameters change, 2012-06-20) it was added to SCRIPT_DEFINES. The two were part of the same series of patches, and given the summary in [1] and [2] it looks like this was probably a case of some earlier version of a later patch being combined with an updated earlier patch. 1. https://lore.kernel.org/git/20120619232231.GA6328@sigill.intra.peff.net/ 2. https://lore.kernel.org/git/20120619232453.GB6496@sigill.intra.peff.net/ Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>