GitLab

	Fmake_byte_code, Fverify_visited_file_modtime, Ffile_exists_p,
	Fdirectory_file_name, Ffile_name_directory,
	expand_and_dir_to_file, Ffile_accessible_directory_p, Fbyte_code,
	Fundo_boundary, truncate_undo_list): Add extern declarations for
	these.

	* lisp.h (DEFVARLISP, DEFVARBOOL, DEFVARINT, DEFVARPERBUFFER):
	Removed these definitions; we should be using the versions whose
	names use underscores.