[RFA] automake mass update, 2 of 2

[Paolo Bonzini]

This patch updates automake to 1.8.5 for boehm-gc, zlib, libffi, 
libmudflap, and removes useless multilibs code for libstdc++-v3.

Bootstrapped/regtested i686-pc-linux-gnu, enabling multilibs as in 
config/i386/t-vxworks:

MULTILIB_OPTIONS = \
   march=i486/march=pentium/march=pentiumpro/march=pentium4
MULTILIB_DIRNAMES = \
   I80486/PENTIUMgnu/PENTIUM2gnu/PENTIUM4gnu

I attach the diff for non-regenerated files.

Ok for mainline?

Paolo
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