* Makefile.in ($(LIB_NAME)): Add --target option to mkimport call.
	* gendef: Drop -w option.  Make callto sigfe function pc-relative
	on x86_64.
	* miscfuncs.cc (__import_address): Drop comment and misguide attempt
	to handle absolute addressing in x86_64 mode.
	* mkimport: Add --target option.  Handle x86_64 target, especially
	create pc-relative jmp calls.