libassuan-3.0.1: Errant declaration of putc_unlocked in src/assuan-defs.h causes a Darwin build to fail.
Since putc_unlocked() has been removed, there is an errant declaration for it in src/assuan-defs.h which should also be removed. It causes Darwin builds to fail since Darwin does have putc_unlocked() and the declaration is no longer excluded by the configure logic.