Typo in README.raspberrypi

Like tittle says.
Merge pull request #2506 from uNiversaI/patch-1

Typo in README.raspberrypi
[droid] add files generated during packaging to gitignore
[osx] - fix missed adaption to the osx package script
[jenkins] - don't clean the pvr addons in first place - when skipping depends build they wouldn't get reinstalled and we would ship without them
depends: update .gitignore for depends for osx and ios builds