[libcxx] [llvm] [libcxx] Provide locale conversions to tests through lit substitution (PR #86649)

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``````````bash
darker --check --diff -r 6a6f9bf38e65ec45b32da4b578e2830341a9b364...e400580b635f29b2292746ef998e6c652398f1c1 libcxx/utils/libcxx/test/features.py llvm/utils/lit/lit/TestRunner.py
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``````````diff
--- libcxx/utils/libcxx/test/features.py	2024-03-26 10:28:53.000000 +0000
+++ libcxx/utils/libcxx/test/features.py	2024-03-26 10:32:12.571005 +0000
@@ -354,10 +354,11 @@
             and "_LIBCPP_HAS_NO_WIDE_CHARACTERS" not in compilerMacros(cfg)
             else [],
         ),
     )
 
+
 # Provide environment locale conversions through substitutions to avoid platform specific
 # maintenance.
 def _getLocaleFlagsAction(cfg, locale, alts, members):
     alts_list = ",".join([f'"{l}"' for l in alts])
     get_member_list = ",".join([f"lc->{m}" for m in members])

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https://github.com/llvm/llvm-project/pull/86649