only auto-set GIT_VERSION if not set
pull source files from github; use redirect
Revert "Download from new git sources folder"

This reverts commit ae47d7a470e94e11d7ec6bad64f0fa3ae1ce1abe.

Conflicts:
	build.sh
	build_package_test_and_bundle.sh
	git-manpages
convert build script to a Makefile