* 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.
