Merge branch 'se/http' into next

* se/http:
Remove possible segfault in http-fetch.
Install git builtins into gitexecdir rather than bindir.
Change GIT-VERSION-GEN to call git commands with "git" not "git-".
cvsimport: replace anonymous sub ref with a normal sub
cvsimport: minor fixups
Problem: 'trap...exit' causes error message when /bin/sh is ash.
Avoid segfault in diff --stat rename output.
Tutorial #2: broken link fix.
git help: remove whatchanged from list of common commands

diff --cc Makefile
Simple merge

diff --cc diff.c
Simple merge