SPARC: add EFD_SEMAPHORE in <bits/eventfd.h> (BZ #16916)

EFD_SEMAPHORE has been added in the main <bits/eventfd.h>, but not in
the SPARC specific version. Fix that.

(cherry picked from commit 83df9ad0cc861ef24f08a88c5a4c055e2516d33c)