vol: Move VOL_CV_TIMEDWAIT to volume_inline.h

vol: Move VOL_CV_TIMEDWAIT to volume_inline.h

Some platforms will give errors for the vol package glock not being
defined in VOL_CV_TIMEDWAIT, since some utilities include volume.h
(with pthreaded ubik enabled) but do not have the vol glock. This
isn't a problem for the other CV_WAIT (et al) macros, since, being
macros, they are not expanded if never referenced. Since
VOL_CV_TIMEDWAIT is a static inline function, however, and at least
some platforms try to compile/link it even if it's not referenced.

So, move it to volume_inline.h, which is only used by the volume
package itself, where we will have the vol glock.

Reviewed-on: http://gerrit.openafs.org/3363
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
(cherry picked from commit e4059c1b812410bd96481cc60c86c67f8733b66f)

Change-Id: Ic1d6286bb148f202b8da010edf48fff93a5a48fb
Reviewed-on: http://gerrit.openafs.org/6268
Reviewed-by: Derrick Brashear <shadow@dementix.org>
Tested-by: BuildBot <buildbot@rampaginggeek.com>