[osx] - add the minimum required osx version to the info.plist - this…

[Memphiz]

… will show a message box on startup when minimum osx version is not installed (also mentioning the needed minimum osx version)

Description

Ensure that the bundle can't be started on to old osx versions

Motivation and Context

To many users post crash reports due to unsupported osx versions. Its much better to use the osx feature here which will present the user with a message box that the minimum osx version is not present

How Has This Been Tested?

This simply sets the osx deployment target as minimum osx version in the info.plist. Tested via generating the info.plist and adding it to a kodi bundle (editing to some very high osx version that is newer then the one i have installed). Results as expected in a dialog telling me i need a newer version for running Kodi.

Screenshot

https://www.dropbox.com/s/fdgnxsbbtv4ln3a/osxminversion_dialog.png?dl=0

Types of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[Memphiz]

Tested on jenkins - http://mirrors.kodi.tv/test-builds/osx/x86_64/kodi-20170404-d37c137-osx_minversion-x86_64.dmg (verified that Info.plist in the bundle has the correct minimum version of 10.8 set).