Predefine DEPRECATED macro in doxyfile

This prevents the macro from making doxyfile miss method definitions
that are deprecated and automatically add the deprecated methods to the
Deprecated List generated by doxygen

Author: romainbrenguier

src/doxyfile

@@ -2041,7 +2041,7 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             =
+PREDEFINED             = "DEPRECATED(msg)= /// \deprecated msg"
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The