gccrs: Change proc macro mapping definition insertion

gccrs: Change proc macro mapping definition insertion

Since the node id already is contained into the proc macro we may omit
it from the function arguments.

gcc/rust/ChangeLog:

	* util/rust-hir-map.cc (Mappings::insert_derive_proc_macro_def):
	Change the function body to fetch the node id from the macro
	parameter.
	(Mappings::insert_bang_proc_macro_def): Likewise.
	(Mappings::insert_attribute_proc_macro_def): Likewise.
	* util/rust-hir-map.h: Update the function's prototype by
	removing the node id from the list of arguments.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>