[gcc r13-777] libstdc++: Remove some unnecessary includes

[gcc r13-777] libstdc++: Remove some unnecessary includes

[Jonathan Wakely]

https://gcc.gnu.org/g:650eadd63022baf6993124d7e9b64141b908459a

commit r13-777-g650eadd63022baf6993124d7e9b64141b908459a
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue May 24 12:15:00 2022 +0100

    libstdc++: Remove some unnecessary includes
    
    These headers do not use anything in <bits/stl_iterator_base_types.h>
    directly, and it's included by <bits/stl_iterator_base_funcs.h> and
    <bits/stl_iterator.h> anyway, because they do need it.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/ranges_algobase.h: Do not include
            <bits/stl_iterator_base_types.h>.
            * include/std/string: Likewise.
            * include/std/variant: Likewise.

Diff:
---
 libstdc++-v3/include/bits/ranges_algobase.h | 1 -
 libstdc++-v3/include/std/string             | 1 -
 libstdc++-v3/include/std/variant            | 1 -
 3 files changed, 3 deletions(-)

diff --git a/libstdc++-v3/include/bits/ranges_algobase.h b/libstdc++-v3/include/bits/ranges_algobase.h
index 1bbc44fc668..f6f0b9c83b0 100644
--- a/libstdc++-v3/include/bits/ranges_algobase.h
+++ b/libstdc++-v3/include/bits/ranges_algobase.h
@@ -33,7 +33,6 @@
 #if __cplusplus > 201703L
 
 #include <compare>
-#include <bits/stl_iterator_base_types.h>
 #include <bits/stl_iterator_base_funcs.h>
 #include <bits/stl_iterator.h>
 #include <bits/ranges_base.h> // ranges::begin, ranges::range etc.
diff --git a/libstdc++-v3/include/std/string b/libstdc++-v3/include/std/string
index 24051663f74..4a0633067bd 100644
--- a/libstdc++-v3/include/std/string
+++ b/libstdc++-v3/include/std/string
@@ -42,7 +42,6 @@
 #include <bits/cpp_type_traits.h>
 #include <bits/localefwd.h>    // For operators >>, <<, and getline.
 #include <bits/ostream_insert.h>
-#include <bits/stl_iterator_base_types.h>
 #include <bits/stl_iterator_base_funcs.h>
 #include <bits/stl_iterator.h>
 #include <bits/stl_function.h> // For less
diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index beed396fccb..c5f25ef6b47 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -40,7 +40,6 @@
 #include <bits/functional_hash.h>
 #include <bits/invoke.h>
 #include <bits/parse_numbers.h>
-#include <bits/stl_iterator_base_types.h>
 #include <bits/stl_iterator_base_funcs.h>
 #include <bits/stl_construct.h>
 #include <bits/utility.h> // in_place_index_t