qemuutil: remove qemu_set_fd_handler duplicate symbol

libqemuutil has two definitions of qemu_set_fd_handler.  This
is not needed since the only users of the function are
qemu-io.c and the emulators, both of which already include
util/main-loop.c.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <d0c5aa88-029e-4328-7a53-482a3010c5f8@redhat.com>
Tested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20210318155519.1224118-2-armbru@redhat.com>

stubs/meson.build

@@ -34,7 +34,6 @@ stub_ss.add(files('ram-block.c'))
 stub_ss.add(files('ramfb.c'))
 stub_ss.add(files('replay.c'))
 stub_ss.add(files('runstate-check.c'))
-stub_ss.add(files('set-fd-handler.c'))
 stub_ss.add(files('sysbus.c'))
 stub_ss.add(files('target-get-monitor-def.c'))
 stub_ss.add(files('target-monitor-defs.c'))

stubs/set-fd-handler.c

-#include "qemu/osdep.h"
-#include "qemu/main-loop.h"
-
-void qemu_set_fd_handler(int fd,
-                         IOHandler *fd_read,
-                         IOHandler *fd_write,
-                         void *opaque)
-{
-    abort();
-}