flux_reactor_create(3): drop active_incref/decref

Problem: flux_reactor_active_incref() and flux_reactor_active_decref()
appear in man pages but are no longer available.

Remove them.

doc/Makefile.am

@@ -204,8 +204,6 @@ MAN3_FILES_SECONDARY = \
 	man3/flux_reactor_run.3 \
 	man3/flux_reactor_stop.3 \
 	man3/flux_reactor_stop_error.3 \
-	man3/flux_reactor_active_incref.3 \
-	man3/flux_reactor_active_decref.3 \
 	man3/flux_fd_watcher_get_fd.3 \
 	man3/flux_watcher_stop.3 \
 	man3/flux_watcher_is_active.3 \

doc/man3/flux_reactor_create.rst

@@ -21,10 +21,6 @@ SYNOPSIS
 
   void flux_reactor_stop_error (flux_reactor_t *r);
 
-  void flux_reactor_active_incref (flux_reactor_t *r);
-
-  void flux_reactor_active_decref (flux_reactor_t *r);
-
 Link with :command:`-lflux-core`.
 
 DESCRIPTION
@@ -81,16 +77,6 @@ The caller should ensure that a valid error code has been assigned to
 :func:`flux_reactor_create` time. Freeing of the underlying resources will
 be deferred if there are any remaining watchers associated with the reactor.
 
-:func:`flux_reactor_active_decref` and :func:`flux_reactor_active_incref`
-manipulate the reactor's internal count of active watchers. Each active
-watcher takes a reference count on the reactor, and the reactor returns
-when this count reaches zero. It is useful sometimes to have a watcher that
-can remain active without preventing the reactor from exiting. To achieve this,
-call :func:`flux_reactor_active_decref` after the watcher is started, and
-:func:`flux_reactor_active_incref` before the watcher is stopped.
-Remember that destroying an active reactor internally stops it,
-so be sure to stop/incref such a watcher first.
-
 
 RETURN VALUE
 ============

doc/manpages.py

@@ -202,8 +202,6 @@
     ('man3/flux_reactor_create', 'flux_reactor_run', 'create/destroy/control event reactor object', [author], 3),
     ('man3/flux_reactor_create', 'flux_reactor_stop', 'create/destroy/control event reactor object', [author], 3),
     ('man3/flux_reactor_create', 'flux_reactor_stop_error', 'create/destroy/control event reactor object', [author], 3),
-    ('man3/flux_reactor_create', 'flux_reactor_active_incref', 'create/destroy/control event reactor object', [author], 3),
-    ('man3/flux_reactor_create', 'flux_reactor_active_decref', 'create/destroy/control event reactor object', [author], 3),
     ('man3/flux_reactor_create', 'flux_reactor_create', 'create/destroy/control event reactor object', [author], 3),
     ('man3/flux_reactor_now', 'flux_reactor_now_update', 'get/update reactor time', [author], 3),
     ('man3/flux_reactor_now', 'flux_reactor_now', 'get/update reactor time', [author], 3),