Update emulators/mips64emul to 20040627.

Changes:

27 Jun 2004:
(Early.) I found and fixed an interrupt related bug in the BT459 ramdac
device, which affected the performance of any machine using the PMAG-BA
negatively (that means DECstations), so now Ultrix 4.2 boots into graphical
login in about 25 seconds! Wow. For X11 bitdepths other than 8 or 24, a
warning message is printed at startup. Adding a BUGS file containing a
list of known bugs. I'm doing a lot of other minor fixes, optimizations,
and beautifying of the code as well. I measured the time of another full
NetBSD 1.6.2 install, on the same host and with the same compiler as on
the 24th of June:

        Runtime flags:  -CR4000 -D2 -q -M32 -I6000000
        Total install time (NetBSD 1.6.2, silent mode): about 50 minutes
        Total time until the login prompt appears:  about 2 minutes
        (This is with -CR4000 and without -X.)
        Compiling the emulator inside itself: 1.5 hours

-fomit-frame-pointer is now enabled by default by the configure script,
if the C compiler supports it. Adding a minimal man page, doc/mips64emul.1.

25 Jun 2004:
(Later) Adding a -v (verbose) command line option. If -v is not specified,
the emulator goes into -q (quiet) mode just before it starts to execute
MIPS code.

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