[TextAPI] Remove TBD file attributes that aren't used anymore.

UUID's & `installapi` flag are no longer useful in recent apple linker/tapi.
The reason for removing them is that these are attributes that record
how a library was built but not really about the library itself. TBD
files now only track information this is important as link time
dependencies.

Reviewed By: ributzka

Differential Revision: https://reviews.llvm.org/D149861