BUG: don't include MacroLibrary.cmake, but add a cmake module which implements ADD_FILE_DEPENDENCIES()

ENH: mark the variables from FindPNG.cmake as advanced

Alex

Modules/AddFileDependencies.cmake

@@ -0,0 +1,16 @@
+# - ADD_FILE_DEPENDENCIES(source_file depend_files...)
+# Adds the given files as dependencies to source_file
+#
+
+MACRO(ADD_FILE_DEPENDENCIES _file)
+
+   GET_SOURCE_FILE_PROPERTY(_deps ${_file} OBJECT_DEPENDS)
+   IF (_deps)
+      SET(_deps ${_deps} ${ARGN})
+   ELSE (_deps)
+      SET(_deps ${ARGN})
+   ENDIF (_deps)
+
+   SET_SOURCE_FILES_PROPERTIES(${_file} PROPERTIES OBJECT_DEPENDS "${_deps}")
+
+ENDMACRO(ADD_FILE_DEPENDENCIES)