Cross-build breakage with libstdc++-v3 doc changes

[Benjamin Kosnik]

> > ...or for cross-targets, breakage.  Something went wrong with
> > this or subsequent changes; somewhere in the r183262:183268 I've
> > started getting:
> [snip]
> > checking
> > for /usr/share/xml/docbook/stylesheet/docbook-xsl-ns/epub3/chunk.xsl...
> > configure: error: cannot check for file existence when cross
> > compiling make[1]: *** [configure-target-libstdc++-v3] Error 1
> > make[1]: Leaving directory `/tmp/hpautotest-gcc1/cris-elf/gccobj'
> > make: *** [all] Error 2
> 
> Yes, I'm seeing the same problem when building a spu-elf
> cross-compiler ...

Testing this patch, will check it in if passes, sorry.

-benjamin
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