PR 32507, PRIx64 in error messages on 32-bit mingw

PR 32507, PRIx64 in error messages on 32-bit mingw

People, including me, had forgotten that the bfd_error_handler just
handled standard printf format strings, not MSC %I64 and suchlike.
Using PRIx64 and similar in errors does not work if the host compiler
headers define those formats as the Microsoft %I64 variety.  (We
handled %ll OK, editing it to %I64 on such hosts.)

	PR 32507
	* bfd.c (_bfd_doprnt, _bfd_doprnt_scan): Handle %I64 and %I32
	in input strings if the host defines PRId64 as "I64d".
	Edit %ll to %I64 on detecting PRId64 as "I64d" rather than on
	a preprocessor define.