[libcxx] Add `LIBCXX_HAS_TERMINAL_AVAILABLE` CMake option to disable `print` terminal checks (#99259)

Adds a new CMake option called `LIBCXX_HAS_TERMINAL_AVAILABLE` that
prevents us from checking for `isatty`.

libcxx/CMakeLists.txt

diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index 6168c76..273b223 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -97,6 +97,8 @@
   "Whether to include support for Unicode in the library. Disabling Unicode can
    be useful when porting to platforms that don't support UTF-8 encoding (e.g.
    embedded)." ON)
+option(LIBCXX_HAS_TERMINAL_AVAILABLE
+  "Build libc++ with support for checking whether a stream is a terminal." ON)
 option(LIBCXX_ENABLE_WIDE_CHARACTERS
   "Whether to include support for wide characters in the library. Disabling
    wide character support can be useful when porting to platforms that don't
@@ -744,6 +746,7 @@
 config_define_if(LIBCXX_ABI_FORCE_MICROSOFT _LIBCPP_ABI_FORCE_MICROSOFT)
 config_define_if_not(LIBCXX_ENABLE_THREADS _LIBCPP_HAS_NO_THREADS)
 config_define_if_not(LIBCXX_ENABLE_MONOTONIC_CLOCK _LIBCPP_HAS_NO_MONOTONIC_CLOCK)
+config_define_if_not(LIBCXX_HAS_TERMINAL_AVAILABLE _LIBCPP_HAS_NO_TERMINAL)
 if (NOT LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION STREQUAL "default")
   config_define("${LIBCXX_TYPEINFO_COMPARISON_IMPLEMENTATION}" _LIBCPP_TYPEINFO_COMPARISON_IMPLEMENTATION)
 endif()