Merge topic 'iwyu-update'

ea7177b9 cmCustomCommandGenerator: Fix include-what-you-use diagnostic

Acked-by: Kitware Robot <[email protected]>
Merge-request: !1252

Source/cmCustomCommandGenerator.cxx

@@ -13,6 +13,8 @@
 #include "cmSystemTools.h"
 #include "cm_auto_ptr.hxx"
 
+#include <stddef.h>
+
 cmCustomCommandGenerator::cmCustomCommandGenerator(cmCustomCommand const& cc,
                                                    const std::string& config,
                                                    cmLocalGenerator* lg)