build: drop sbindir variable

The sbindir variable is provided for free with autotools.  For proper
replacement you must use @sbindir@.

Reference: www.gnu.org/prep/standards/html_node/Directory-Variables.html

Change-Id: I8847256a8ee5178f65427d986eaf54f5ba2bb7e1
Signed-off-by: Patrick Venture <venture@google.com>
1 file changed