[macos] allow primary executable target to be built as bundle

[fuzzard]

Description

Instead of building the kodi target as a binary, build as a bundle. This fixes not being able to use keyboard input when running kodi target in xcode for debugging.

Motivation and context

Inability for keyboard to work when running kodi via xcode.

How has this been tested?

Build via xcode/unix makefiles, generated dmg and executing
Build Kodi target in xcode project, and keyboard input works.

What is the effect on users?

N/A

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

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

[enen92]

Runtime tested. Thanks much