Include necessary headers in commands

Source/cmAddLibraryCommand.cxx

@@ -2,12 +2,20 @@
    file Copyright.txt or https://cmake.org/licensing for details.  */
 #include "cmAddLibraryCommand.h"
 
+#include <sstream>
+
+#include "cmGeneratorExpression.h"
 #include "cmGlobalGenerator.h"
+#include "cmMakefile.h"
+#include "cmPolicies.h"
 #include "cmState.h"
 #include "cmStateTypes.h"
 #include "cmSystemTools.h"
+#include "cmTarget.h"
 #include "cmake.h"
 
+class cmExecutionStatus;
+
 // cmLibraryCommand
 bool cmAddLibraryCommand::InitialPass(std::vector<std::string> const& args,
                                       cmExecutionStatus&)