[gcc r11-11432] libstdc++: Add include guard to simd-internal header

[Matthias Kretz]

https://gcc.gnu.org/g:ef919c8c6d5fe65c56279261c08f9033c4b449cd

commit r11-11432-gef919c8c6d5fe65c56279261c08f9033c4b449cd
Author: Matthias Kretz <m.kretz@gsi.de>
Date:   Wed Apr 17 10:12:42 2024 +0200

    libstdc++: Add include guard to simd-internal header
    
    Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
    
    libstdc++-v3/ChangeLog:
    
            * include/experimental/bits/numeric_traits.h: Add include guard.
    
    (cherry picked from commit 3cfe94ad28102618c14a91c0a83d9e5cc7df69d7)

Diff:
---
 libstdc++-v3/include/experimental/bits/numeric_traits.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libstdc++-v3/include/experimental/bits/numeric_traits.h b/libstdc++-v3/include/experimental/bits/numeric_traits.h
index 0a1c711a559b..fd6ad761fb3d 100644
--- a/libstdc++-v3/include/experimental/bits/numeric_traits.h
+++ b/libstdc++-v3/include/experimental/bits/numeric_traits.h
@@ -22,6 +22,9 @@
 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 // <http://www.gnu.org/licenses/>.
 
+#ifndef _GLIBCXX_EXPERIMENTAL_BITS_NUMERIC_TRAITS_H
+#define _GLIBCXX_EXPERIMENTAL_BITS_NUMERIC_TRAITS_H
+
 #include <type_traits>
 
 namespace std {
@@ -565,3 +568,4 @@ template <>
 #endif // __FINITE_MATH_ONLY__
 
 } // namespace std
+#endif  // _GLIBCXX_EXPERIMENTAL_BITS_NUMERIC_TRAITS_H