* etags.c (C_entries): Initialise the new members of TOKEN.

* etags.c (C_entries): Initialise the new members of TOKEN.
	(C_entries): Do not allocate a new space for each token found by
	consider_token.  Let make_tag do that instead.
	(make_tag): Since now TOKEN has memory of where it is taken from,
	this new macro substitutes both make_tag_from_new_lb and
	make_tag_from_oth_lb.  All callers changed.
	(TOKEN): Add linepos and buffer members.
	(main): Initialise token_str.
	(lang_extensions): Recognise .c++ and .h++ as C++ file suffixes.
	(token_str): New global variable used by C_entries.