z3.cabal: Add CPP to other extensions

IagoAbal · IagoAbal · commit f3cf151fa326 · 2018-05-12T21:56:00.000+02:00
Follows: eb76353ff75 ("Fix compatibility with base 4.11 due to SMP")
diff --git a/z3.cabal b/z3.cabal
@@ -67,7 +67,8 @@ Library
                          ForeignFunctionInterface
                          MultiParamTypeClasses
 
-    Other-extensions:    DeriveDataTypeable
+    Other-extensions:    CPP
+                         DeriveDataTypeable
                          EmptyDataDecls
                          GeneralizedNewtypeDeriving
                          PatternGuards
