Revert "Use cil_write_build_ast"

Revert submission 1827311-update_libselinux

Reason for revert: b/200771997 
Reverted Changes:
I088d1e94c:Fix build and use new cil_write_build_ast
I14dc4dc58:Merge remote-tracking branch 'aosp/upstream-master...
I7b77f4469:Use cil_write_build_ast

Change-Id: Ib4983288feb0139ed12cb3a07edd60d2d457022f
1 file changed