Remove config_static.h

CMake isn't as terrible slow as automake to regenerate
config.h

Change-Id: I2f4e777ce729d66375724857bca83487e94f07db
Reviewed-on: http://review.couchbase.org/35434
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>