[libc++] Remove obsolete bsd_locale_defaults.h (#122276)

Supported platforms who used to need this header now go through the new
locale base API instead, so that header is not required anymore.

Author: ldionne

libcxx/include/CMakeLists.txt

@@ -498,7 +498,6 @@ set(files
   __locale
   __locale_dir/locale_base_api.h
   __locale_dir/locale_base_api/android.h
-  __locale_dir/locale_base_api/bsd_locale_defaults.h
   __locale_dir/locale_base_api/bsd_locale_fallbacks.h
   __locale_dir/locale_base_api/fuchsia.h
   __locale_dir/locale_base_api/ibm.h

libcxx/include/__config

@@ -629,10 +629,6 @@ typedef __char32_t char32_t;
 #    define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
 #  endif // _LIBCPP_CXX03_LANG
 
-#  if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || defined(__NetBSD__)
-#    define _LIBCPP_LOCALE__L_EXTENSIONS 1
-#  endif
-
 #  ifdef __FreeBSD__
 #    define _DECLARE_C99_LDBL_MATH 1
 #  endif

libcxx/include/__locale_dir/locale_base_api.h

@@ -117,11 +117,7 @@
 #    include <__locale_dir/locale_base_api/musl.h>
 #  endif
 
-#  ifdef _LIBCPP_LOCALE__L_EXTENSIONS
-#    include <__locale_dir/locale_base_api/bsd_locale_defaults.h>
-#  else
-#    include <__locale_dir/locale_base_api/bsd_locale_fallbacks.h>
-#  endif
+#  include <__locale_dir/locale_base_api/bsd_locale_fallbacks.h>
 
 #  include <__cstddef/size_t.h>
 #  include <__utility/forward.h>

libcxx/include/__locale_dir/locale_base_api/bsd_locale_defaults.h

@@ -219,7 +219,7 @@ template <class charT> class messages_byname;
 #    include <streambuf>
 #    include <version>
 
-// TODO: Properly qualify calls now that __bsd_locale_defaults.h defines functions instead of macros
+// TODO: Properly qualify calls now that the locale base API defines functions instead of macros
 // NOLINTBEGIN(libcpp-robust-against-adl)
 
 #    if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))

libcxx/include/locale

@@ -1483,7 +1483,6 @@ module std [system] {
 
     module locale_base_api {
       textual header "__locale_dir/locale_base_api/android.h"
-      textual header "__locale_dir/locale_base_api/bsd_locale_defaults.h"
       textual header "__locale_dir/locale_base_api/bsd_locale_fallbacks.h"
       textual header "__locale_dir/locale_base_api/fuchsia.h"
       textual header "__locale_dir/locale_base_api/ibm.h"