* Makefile.in (CYGWIN_LDFLAGS): Replace -static-lib* with -static.
(MINGW_LDFLAGS): Ditto.
(ZLIB): Simplify accordingly.
* include/error.h (error_message_count): Declare as dllimport.
(error_one_per_line): Ditto.
(error_print_progname): Ditto.
	* libc/include/sys/_types.h (_ssize_t): Define as signed equivalent of
	size_t with GCC.