[v3] libstdc++/47145

[Benjamin Kosnik]

Conditionally set XSL_STYLE_DIR at configure time for either debian or
fedora/RHEL based systems. As discussed in bugzilla. 

For convenience, this patch steps around the STYLESHEET_FLAG question by
just punting to the net for validation only. STYLESHEET_FLAG is only
used in the validation makefile rules, and these are not in the
critical path for things like "make html" where local docbook
stylesheet files are required. So a bit of a hit time-wise is not a
major negative, whereas all developers being on the same page with
respect to validation and being able to do it even w/o the rest of the
stylesheets seems like a clear win. 

Matthias, this should allow you to kill

libstdc++-stylesheets:
  Fix libstdc++ stylesheet detection

from your 4.6.0 patchset

-benjamin

tested x86/linux
tested x86/linux -x- arm-eabi
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