Merge branch 'maint-1.6.6' into maint-1.7.0

* maint-1.6.6:
request-pull.txt: Document -p option
Check size of path buffer before writing into it
rev-parse: fix --parse-opt --keep-dashdash --stop-at-non-option

diff --cc builtin-rev-parse.c
Simple merge

diff --cc setup.c
Simple merge