IWYU: Update for Debian 12 CI job

`include-what-you-use` diagnostics, in practice, are specific to
the environment's compiler and standard library.  Update includes
to satisfy IWYU for our CI job under Debian 12.

1 files changed, 5 insertions, 3 deletions

diff --git a/Source/cmMakefile.h b/Source/cmMakefile.h
index 79a98cd..b81af2f 100644
--- a/Source/cmMakefile.h
+++ b/Source/cmMakefile.h
@@ -25,9 +25,9 @@
 
 #include "cmAlgorithms.h"
 #include "cmCustomCommand.h"
-#include "cmCustomCommandTypes.h"
+#include "cmFunctionBlocker.h"
 #include "cmListFileCache.h"
-#include "cmMessageType.h"
+#include "cmMessageType.h" // IWYU pragma: keep
 #include "cmNewLineStyle.h"
 #include "cmPolicies.h"
 #include "cmSourceFileLocationKind.h"
@@ -43,12 +43,14 @@
 #  include "cmSourceGroup.h"
 #endif
 
+enum class cmCustomCommandType;
+enum class cmObjectLibraryCommands;
+
 class cmCompiledGeneratorExpression;
 class cmCustomCommandLines;
 class cmExecutionStatus;
 class cmExpandedCommandArgument;
 class cmExportBuildFileGenerator;
-class cmFunctionBlocker;
 class cmGeneratorExpressionEvaluationFile;
 class cmGlobalGenerator;
 class cmInstallGenerator;