added barriers, started working on libraries

tier2/filesystem_libc.cpp

@@ -107,6 +107,8 @@ public:
 		V_fclose(pHandle->m_pFile);
 		delete pHandle;
 	}
+
+	virtual CUtlBuffer<unsigned char> Read( IFileHandle *pFile ) override { return NULL; }; 
 };
 
 EXPOSE_FILESYSTEM(CLIBCFileSystem, "sysfs");