Fix a logic error in a last-minute change to build-cocoa.
Fix a logic error in a last-minute change to build-cocoa.

Switch the order of arguments to `tr` so that we convert the input to
uppercase, rather than to lowercase.

realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core,realm/realm-core