lldap: fix the building failure when gcc5 is used or DEBUG_BUILD is 1

1. fix the building failure when host is gcc5
2. fix the building failure when DEBUG_BUILD is 1 by removal of -Werror
   Remove -Werror, since it is suitable to develop only; otherwise when
   gcc adds -O0 option to compile codes, the error will be generated
   since the warning:
     //#  warning _FORTIFY_SOURCE requires compiling with optimization (-O)

Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>