Merge branch 'nd/error-errno'

The code for warning_errno/die_errno has been refactored and a new
error_errno() reporting helper is introduced.

* nd/error-errno: (41 commits)
wrapper.c: use warning_errno()
vcs-svn: use error_errno()
upload-pack.c: use error_errno()
unpack-trees.c: use error_errno()
transport-helper.c: use error_errno()
sha1_file.c: use {error,die,warning}_errno()
server-info.c: use error_errno()
sequencer.c: use error_errno()
run-command.c: use error_errno()
rerere.c: use error_errno() and warning_errno()
reachable.c: use error_errno()
mailmap.c: use error_errno()
ident.c: use warning_errno()
http.c: use error_errno() and warning_errno()
grep.c: use error_errno()
gpg-interface.c: use error_errno()
fast-import.c: use error_errno()
entry.c: use error_errno()
editor.c: use error_errno()
diff-no-index.c: use error_errno()
...

diff --cc builtin/branch.c
Simple merge

diff --cc builtin/fetch.c
Simple merge

diff --cc builtin/pack-objects.c
Simple merge

diff --cc builtin/rm.c
Simple merge

diff --cc builtin/worktree.c
Simple merge

diff --cc config.c
Simple merge

diff --cc credential-cache--daemon.c
Simple merge

diff --cc git-compat-util.h
Simple merge

diff --cc gpg-interface.c
Simple merge

diff --cc http.c
Simple merge

diff --cc ident.c
Simple merge

diff --cc mailmap.c
Simple merge

diff --cc rerere.c
Simple merge

diff --cc run-command.c
Simple merge

diff --cc transport-helper.c
Simple merge

diff --cc unpack-trees.c
Simple merge

diff --cc upload-pack.c
Simple merge

diff --cc wrapper.c
Simple merge