Drop SIGAR_INLINE

The inline definition caused a massive amount of compile
warnings on SmartOS with gcc, and resulted in link error. Given
that its not a "hot spot" in our application lets just nuke
it.

Change-Id: Idb7209a9c1b97db4f091399ea69ccb15c5d3bdc4
Reviewed-on: http://review.couchbase.org/40929
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>