[cmake] cleaning_configure_file

add a wrapper to automatically add generated files to clean target

cmake/CleaningConfigureFile.cmake

@@ -0,0 +1,14 @@
+# Little helper that adds the generated file to the
+# files to be cleaned in the current directory.
+#
+# Handy if the generated files might have changed
+#
+
+function(cleaning_configure_file SRC DST)
+	configure_file(${SRC} ${DST} ${ARGN})
+        set_property(
+                DIRECTORY
+                APPEND
+                PROPERTY ADDITIONAL_CLEAN_FILES ${DST}
+        )
+endfunction()