docs: Document 'make EXTRAVERSION=xyz' and scripts/tarball.sh

Document the existence of the EXTRAVERSION field and the information
expected to be present in it.  Document the use of tarball.sh in build
environments that lack git.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
1 file changed
tree: 74d1445fc2892aa043c857c00b5b53ac79204cef
  1. docs/
  2. scripts/
  3. src/
  4. vgasrc/
  5. .gitignore
  6. COPYING
  7. COPYING.LESSER
  8. Makefile
  9. README