* src/assuan-pipe-connect.c (assuan_pipe_wait_server_termination)
(assuan_pipe_kill_server): New.
* src/assuan.h.in: Add new functions.
* src/libassuan.def: Add symbols for those functions.
* src/libassuan.vers: Likewise.
* src/system-posix.c (__assuan_waitpid): Extend the semantics for
OPTIONS.
* src/system-w32.c (__assuan_waitpid): Likewise.