Merge branch 'es/bugreport'

The "bugreport" tool.

* es/bugreport:
  bugreport: drop extraneous includes
  bugreport: add compiler info
  bugreport: add uname info
  bugreport: gather git version and build info
  bugreport: add tool to generate debugging info
  help: move list_config_help to builtin/help

diff --cc .gitignore
Simple merge

diff --cc Makefile
Simple merge

diff --cc builtin/help.c
Simple merge

diff --cc config.mak.uname
Simple merge

diff --cc strbuf.c
Simple merge

diff --cc strbuf.h
Simple merge