Updating top-level autoconf to 2.59

[Steve Ellcey]

> Hum...  from Makefile.in:
> 
> BASE_TARGET_EXPORTS = \
>          CC="$(CC_FOR_TARGET)"; export CC; \
> RAW_CXX_TARGET_EXPORTS = \
>          $(BASE_TARGET_EXPORTS) \
>          CXX_FOR_TARGET="$(RAW_CXX_FOR_TARGET)"; export  
> CXX_FOR_TARGET; \
> configure-target-libstdc++-v3:
>          $(RAW_CXX_TARGET_EXPORTS) \
> 
> is supposed to handle resetting these as I read it, though, I'm not  
> en expert.  Does you're Makefile.in have these?

My toplevel Makefile.in seems to have all these lines.  I didn't change
any Makefile.* files or rerun automake or aclocal.  I only reran
autoconf.

Steve Ellcey
sje@cup.hp.com