Sparse support the expansion of one-symbol-builtin macros like __FILE__. It also support builtin macros with an argument, like 'defined()' or '__has_attribute()'. However, these last one are only expanded inside a pre-processor conditional expression. This is correct for 'defined()' but macros like '__has_attribute()' should be expanded in all contexts, like user defined macros. So, add support for the general expansion of such macros. Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>