[libcxx] [llvm] [libc++] Refactor the configuration macros to being always defined (PR #112094)

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``````````bash
darker --check --diff -r 9f24c145494ee238e65e25205a4dcb4451f009ae...c44ba766fdae9d1269cd6f4661189d0573d9687f libcxx/test/libcxx/feature_test_macro/ftm_metadata.sh.py libcxx/test/libcxx/feature_test_macro/version_header.sh.py libcxx/test/libcxx/feature_test_macro/version_header_implementation.sh.py libcxx/utils/generate_feature_test_macro_components.py libcxx/utils/libcxx/header_information.py libcxx/utils/libcxx/test/dsl.py libcxx/utils/libcxx/test/features.py
``````````

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``````````diff
--- utils/libcxx/test/features.py	2024-10-12 12:09:11.000000 +0000
+++ utils/libcxx/test/features.py	2024-10-12 12:20:02.398900 +0000
@@ -229,11 +229,12 @@
     ),
     # Check for a Windows UCRT bug (fixed in UCRT/Windows 10.0.20348.0):
     # https://developercommunity.visualstudio.com/t/utf-8-locales-break-ctype-functions-for-wchar-type/1653678
     Feature(
         name="win32-broken-utf8-wchar-ctype",
-        when=lambda cfg: not "_LIBCPP_HAS_LOCALIZATION" in compilerMacros(cfg) or compilerMacros(cfg)["_LIBCPP_HAS_LOCALIZATION"]
+        when=lambda cfg: not "_LIBCPP_HAS_LOCALIZATION" in compilerMacros(cfg)
+        or compilerMacros(cfg)["_LIBCPP_HAS_LOCALIZATION"]
         and "_WIN32" in compilerMacros(cfg)
         and not programSucceeds(
             cfg,
             """
             #include <locale.h>
@@ -285,11 +286,12 @@
     ),
     # Check for Glibc < 2.27, where the ru_RU.UTF-8 locale had
     # mon_decimal_point == ".", which our tests don't handle.
     Feature(
         name="glibc-old-ru_RU-decimal-point",
-        when=lambda cfg: not "_LIBCPP_HAS_LOCALIZATION" in compilerMacros(cfg) or compilerMacros(cfg)["_LIBCPP_HAS_LOCALIZATION"]
+        when=lambda cfg: not "_LIBCPP_HAS_LOCALIZATION" in compilerMacros(cfg)
+        or compilerMacros(cfg)["_LIBCPP_HAS_LOCALIZATION"]
         and not programSucceeds(
             cfg,
             """
             #include <locale.h>
             #include <string.h>
@@ -400,11 +402,12 @@
 }
 for macro, feature in inverted_macros.items():
     DEFAULT_FEATURES.append(
         Feature(
             name=feature,
-            when=lambda cfg, m=macro: m in compilerMacros(cfg) and not compilerMacros(cfg)[m]
+            when=lambda cfg, m=macro: m in compilerMacros(cfg)
+            and not compilerMacros(cfg)[m],
         )
     )
 
 # Mapping from canonical locale names (used in the tests) to possible locale
 # names on various systems. Each locale is considered supported if any of the

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https://github.com/llvm/llvm-project/pull/112094