Merge branch 'mm/pull-upload-pack' into maint

"git pull" in recent releases of Git has a regression in the code that allows custom path to the --upload-pack=<program>. This has been corrected. Note that this is irrelevant for 'master' with "git pull" rewritten in C. * mm/pull-upload-pack: pull: pass upload_pack only when it was given pull.sh: quote $upload_pack when passing it to git-fetch