* dlltool.h: New file.

	* dlltool.h: New file.
	* deflex.l: Include dlltool.h and libiberty.h.  Don't declare
	strdup.  Use xstrdup rather than strdup.
	* defparse.y: Include bfd.h, bucomm.h, and dlltool.h.
	* dlltool.c: Include dlltool.h and time.h.  Make a lot of
	variables and functions static.  Make a lot of char * variables
	and parameters const.  Add declarations for static functions.  Do
	some reindenting.  Hide more PowerPC stuff inside DLLTOOL_PPC.