Autodetect path to 'Platforms'
Update build-gambit-iOS to 4.6.7, make changev keep it in sync
Don't download if we already have it.
Simplify, rename  ->
Remove $ios_kind (there's only one kind)
Remove more noise lines
Always use latest iOS SDK
Add --no-update flag to build-gambit-iOS
Merge pull request #13 from maitria/gambit_ios_script_update

Gambit ios script update