build: use LIB_SELINUX as set by gnulib
build: use LIB_SELINUX as set by gnulib

* configure.ac: do not set up LIB_SELINUX, gnulib does that

camptocamp/augeas,camptocamp/augeas,camptocamp/augeas,dafugg/augeas,hercules-team/augeas,jjlin/augeas,hercules-team/augeas-do-not-use,GeoffWilliams/augeas,domcleal/augeas,jtopjian/augeas,mlichvar/augeas,domcleal/augeas,kumy/augeas,domcleal/augeas,bkearney/augeas,kunkku/augeas,jtopjian/augeas,jasperla/augeas,kumy/augeas,lutter/augeas,lutter/augeas,MikaelSmith/augeas,kumy/augeas,GeoffWilliams/augeas,hercules-team/augeas-do-not-use,mlichvar/augeas,jjlin/augeas,jjlin/augeas,kunkku/augeas,manandbytes/augeas,raphink/augeas,ptoscano/augeas,raphink/augeas,kunkku/augeas,bkearney/augeas,pevalme/augeas,bkearney/augeas,mlichvar/augeas,MikaelSmith/augeas,kumy/augeas,hercules-team/augeas-do-not-use,dafugg/augeas,mchf/augeas,mchf/augeas,hercules-team/augeas,ptoscano/augeas,jasperla/augeas,pevalme/augeas,manandbytes/augeas,ptoscano/augeas,dafugg/augeas,camptocamp/augeas,pevalme/augeas,lutter/augeas,bkearney/augeas