sparc32 vs lib/mpi

[Al Viro]

	I realize that very few people care about sparc32 these days,
but...
	a) __clz_tab[] is defined (with identical contents) in
lib/mpi/mpi-bit.c and arch/sparc/lib/divdi3.S.  Linker is unhappy,
of course...
	b) the same thing ends up using __udiv_qrnnd(), which simply
does not exist on sparc32.  There's a Cthulhu-scaring cascade of
ifdefs in lib/mpi/longlong.h, with several variants of udiv_qrnnd()
for sparc.  Unfortunately, it falls back on use of __udiv_qrnnd()...
Note that arch/sparc/math-emu/sfp-util_32.h has a definition of
udiv_qrnnd() which might match one of inline assembly variants in
lib/mpi/longlong.h.  Or not.  BTW, what the hell is LONGLONG_STANDALONE?

	Could somebody who might remember still remember that stuff
come up with comments?  For now I'm disabling everything from
INTEGRITY_SIGNATURE down to MPILIB on sparc32 cross-build, but it
would be nice to get it at least somewhat sorted out...
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