Ignore cex in SMT test

Author: Leo Alt

test/libsolidity/smtCheckerTests/userTypes/multisource_module.sol

@@ -16,6 +16,7 @@ contract C {
 // ====
 // SMTEngine: all
 // SMTIgnoreOS: macos
+// SMTIgnoreCex: yes
 // ----
-// Warning 6328: (s2.sol:259-292): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nC.constructor()\nC.h()\n    C.f(5) -- internal call\n    C.f(5) -- internal call
-// Warning 6328: (s2.sol:346-377): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nC.constructor()\nC.h()\n    C.f(5) -- internal call\n    C.f(5) -- internal call\n    C.g(1) -- internal call\n    C.g(1) -- internal call
+// Warning 6328: (s2.sol:259-292): CHC: Assertion violation happens here.
+// Warning 6328: (s2.sol:346-377): CHC: Assertion violation happens here.