* acinclude.m4 (GLIBCXX_ENABLE_CLOCALE): Use GNU locale model for
glibc 2.3 and later, but not uClibc, without an execution test.
* configure: Regenerate.
* doc/xml/manual/configure.xml, doc/xml/manual/prerequisites.xml,
doc/xml/faq.xml: Update.
From-SVN: r159664
