autoconf: 2.59 -> 2.61

[Jeff Johnston]

DJ Delorie wrote:
> In src/newlib/ all the configure files have been generated with autoconf 2.61 except
> these three:
>
> newlib/libm/machine/spu/configure:# Generated by GNU Autoconf 2.59 for newlib 1.15.0.
> newlib/libc/sys/configure:# Generated by GNU Autoconf 2.59 for newlib 1.15.0.
> newlib/libc/machine/configure:# Generated by GNU Autoconf 2.59 for newlib 1.15.0.
>
> Can we convert those too?  Otherwise, you get the occasional error like this:
>
> configure: loading cache .././config.cache
> configure: error: `CXXFLAGS' has changed since the previous run:
> configure:   former value:  -g -O2  -D_GNU_SOURCE
> configure:   current value: -g -O2 -D_GNU_SOURCE
> configure: error: changes in the environment can compromise the build
>
> (note the change in whitespace - this is fixed in 2.61)
>
> Also, in libgloss, they're all 2.59.  Can those be upgraded?
>   
Yes, please go ahead.

-- Jeff J.