Clang: Fix system pre include search path

We now get the resource path from creator. The -fPIC case is working now
too.

Change-Id: Id191e89e6d46706748d50440038a06a349972cc9
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangpchmanager/pchmanagerconnectionclient.cpp

@@ -56,7 +56,8 @@ ClangPchManager::PchManagerConnectionClient::PchManagerConnectionClient(
     pchsDirectory.cd("pchs");
     m_processCreator.setArguments({connectionName(),
                                    Core::ICore::cacheResourcePath() + "/symbol-experimental-v1.db",
-                                   pchsDirectory.absolutePath()});
+                                   pchsDirectory.absolutePath(),
+                                   Core::ICore::resourcePath()});
 
     stdErrPrefixer().setPrefix("PchManagerConnectionClient.stderr: ");
     stdOutPrefixer().setPrefix("PchManagerConnectionClient.stdout: ");

src/plugins/clangpchmanager/projectupdater.cpp

@@ -153,7 +153,6 @@ QStringList ProjectUpdater::toolChainArguments(CppTools::ProjectPart *projectPar
     CompilerOptionsBuilder builder(*projectPart, CppTools::UseSystemHeader::Yes);
 
     builder.addWordWidth();
-    builder.addPicIfCompilerFlagsContainsIt();
     // builder.addTargetTriple(); TODO resarch why target triples are different
     builder.addExtraCodeModelFlags();
     builder.undefineClangVersionMacrosForMsvc();