[PATCH] [libcxx] Add numerous options to libc++ LIT test suite configuration.

[Eric Fiselier]

Changed `enable_warnings` so it sets `-Werror`. Otherwise the switch is pretty useless.

http://reviews.llvm.org/D5877

Files:
  test/lit.cfg
  test/lit.site.cfg.in
  www/index.html
  www/lit_usage.html
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