[gcc r13-2750] libstdc++: Add <initializer_list> to ranges_base.h header

[Jonathan Wakely]

https://gcc.gnu.org/g:26cb69f8b4b9fb46444d164c8edcb73ac5fb2c47

commit r13-2750-g26cb69f8b4b9fb46444d164c8edcb73ac5fb2c47
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Sep 21 00:46:04 2022 +0100

    libstdc++: Add <initializer_list> to ranges_base.h header
    
    The header should be included explicitly to use std::initializer_list.
    With the upcoming changes to make <ranges> available for freestanding
    this becomes an error, because <initializer_list> is no longer provided
    by any of the other headers involved here.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/ranges_base.h: Include <initializer_list>.

Diff:
---
 libstdc++-v3/include/bits/ranges_base.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/include/bits/ranges_base.h b/libstdc++-v3/include/bits/ranges_base.h
index 866d7c56cbc..805f196cc9f 100644
--- a/libstdc++-v3/include/bits/ranges_base.h
+++ b/libstdc++-v3/include/bits/ranges_base.h
@@ -33,6 +33,7 @@
 #pragma GCC system_header
 
 #if __cplusplus > 201703L
+#include <initializer_list>
 #include <bits/iterator_concepts.h>
 #include <ext/numeric_traits.h>
 #include <bits/max_size_type.h>