Adapt failing unit test for value set analysis

The test was failing on two Travis goals, due to the config object being
persistent between different tests in "unit". The link order made another test
set `config.main` to non-empty which made this test fail due to that function
not being found.

Author: Matthias Güdemann

unit/pointer-analysis/custom_value_set_analysis.cpp

@@ -168,12 +168,14 @@ SCENARIO("test_value_set_analysis",
 {
   GIVEN("Normal and custom value-set analysis of CustomVSATest::test")
   {
+    config.set_arch("none");
+    config.main = "";
     null_message_handlert null_output;
     cmdlinet command_line;
 
     // This classpath is the default, but the config object
     // is global and previous unit tests may have altered it
-    command_line.set("java-cp-include-files", ".");
+    command_line.set("java-cp-include-files", "CustomVSATest.class");
     config.java.classpath={"."};
     command_line.args.push_back("pointer-analysis/CustomVSATest.jar");