missed the s390x project when fixing conflict

boostcpp.jam

@@ -624,6 +624,7 @@ rule deduce-architecture ( properties * )
         : /boost/architecture//mips1
         : /boost/architecture//power
         : /boost/architecture//riscv
+        : /boost/architecture//s390x
         : /boost/architecture//sparc
         : /boost/architecture//x86
         : /boost/architecture//combined ] ;