[Tests] Add missing test declaration, for Linux.

Author: ddunbar

Tests/Functional/ValidLayoutTests.swift

@@ -138,6 +138,7 @@ extension DependencyResolutionTestCase {
             ("testInternalComplex", testInternalComplex),
             ("testExternalSimple", testExternalSimple),
             ("testExternalComplex", testExternalComplex),
+            ("testIndirectTestsDontBuild", testIndirectTestsDontBuild),
         ]
     }
 }