Add paths to the search for utempter helper

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

CMakeLists.txt

@@ -607,10 +607,12 @@ if( WITH_UTEMPTER )
         /usr/lib/utempter
         /usr/libexec/utempter
         /usr/libexec
+        /usr/sbin
         /usr/local/lib/${CMAKE_LIBRARY_ARCHITECTURE}/utempter
         /usr/local/lib/utempter
         /usr/local/libexec/utempter
         /usr/local/libexec
+        /usr/local/sbin
     )
     if( UTEMPTER_HELPER )
       message( STATUS "Looking for utempter helper - found" )