Updated xkbcomp packages fix security vulnerabilities

Endless recursion in xkbcomp/expr.c resulting in a crash. CVE-2018-15853 NULL pointer dereference when parsing invalid atoms in ExprResolveLhs resulting in a crash. CVE-2018-15859 NULL pointer dereference in ExprResolveLhs resulting in a crash. CVE-2018-15861 NULL pointer dereference in...