SMTChecker: Add command-line test for cvc4

Author: blishko

test/cmdlineTests/model_checker_cvc4/args

@@ -0,0 +1 @@
+--model-checker-engine bmc --model-checker-solvers cvc4

test/cmdlineTests/model_checker_cvc4/err

@@ -0,0 +1,10 @@
+Warning: BMC: Assertion violation happens here.
+ --> test/cmdlineTests/model_checker_cvc4/input.sol:5:3:
+  |
+5 | 		assert(x > 0);
+  | 		^^^^^^^^^^^^^
+Note: Counterexample:
+  x = 0
+
+Note: Callstack:
+Note:

test/cmdlineTests/model_checker_cvc4/input.sol

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0;
+contract test {
+	function f(uint x) public pure {
+		assert(x > 0);
+	}
+}