Build fails on NS_ENUM and NS_OPTIONS usage

[capnslipp]

When trying to do a fresh post-checkout build, a large number of build warnings and error are thrown around the uses of NS_ENUM and NS_OPTIONS (e.g. NS_ENUM(NSUInteger, PKRevealControllerState) and NS_OPTIONS(NSUInteger, PKRevealControllerType).

Errors include things like:

• type specifier missing, defaults to 'int'
• expected ';' after top level declarator
• expected ')'
• typedef redefinition with different types ('NS_ENUM' (aka 'int (NSUInteger, int)') vs 'unsigned int')
• unknown type name 'PKRevealControllerState'; did you mean 'PKRevealController'?