Clang: Tests: Fix compilation

refactoringclient-test.cpp:126:76: error: no matching function for call to
'ClangRefactoring::RefactoringCompilerOptionsBuilder::build(CppTools::ProjectPart*,
CppTools::ProjectFile::Kind&)'

Broke with:

    commit 36d4d01cd3
    Clang: Take precompiled headers into account when parsing source files

Change-Id: I7c5a2edec0859584ea2b33e144178060788cd4d9
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

tests/unit/unittest/refactoringengine-test.cpp

@@ -108,7 +108,8 @@ void RefactoringEngine::SetUp()
     projectPart->files.push_back(projectFile);
 
     commandLine = RefactoringCompilerOptionsBuilder::build(projectPart.data(),
-                                                           projectFile.kind);
+                                                           projectFile.kind,
+                                                           RefactoringCompilerOptionsBuilder::PchUsage::None);
     commandLine.push_back(qStringFilePath);
 }