0.8.0.45

0.8.0.45
	64 bit alien support on x86, by reference to CMUCL
	... x86/sap.lisp gets transforms for *-sap-ref-64 which
	    do the reference a word at a time
	... teach define-alien-type-method (integer :extract-gen)
	    to know about *-sap-ref-64
	... #!+alpha removed from defknowns for *-sap-ref-64
	... compiler/x86/c-call gets hairy great deftransform %alien-funcall
	    that transforms 64 bit args and return values
	    appropriately.  Lifted & ported from CMUCL by rude mechanicals

	This all could use generifying for endianness and putting
	somewhere that all 32 bit platforms (i.e. everything but
	Alpha, I think) can see it.

	Fix the BSD-specific mess in unix-lseek to use off-t like
	the other platforms do.  Should now work (untested)

	Add mmap/munmap/getpagesize support to SB-POSIX,
	courtesy Rudi Schlatte.

	SB-UNIX:UNIX-IOCTL second argument is signed, as per
	sbcl-devel mail from Vincent Arkesteijn