[gcc r10-9564] libstdc++: Fix -Wunused-local-typedefs warning

[Jonathan Wakely]

https://gcc.gnu.org/g:84ea975e8d3f4404e168f6851ca625517b883098

commit r10-9564-g84ea975e8d3f4404e168f6851ca625517b883098
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Sep 10 18:57:05 2020 +0100

    libstdc++: Fix -Wunused-local-typedefs warning
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/ranges_algobase.h (__equal_fn): Remove unused
            typedef.
    
    (cherry picked from commit 866c53cb2e88e172476185327723df9197c34ae7)

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

diff --git a/libstdc++-v3/include/bits/ranges_algobase.h b/libstdc++-v3/include/bits/ranges_algobase.h
index 618bc7d1006..9c6f1925763 100644
--- a/libstdc++-v3/include/bits/ranges_algobase.h
+++ b/libstdc++-v3/include/bits/ranges_algobase.h
@@ -105,7 +105,6 @@ namespace ranges
 	      return false;
 
 	    using _ValueType1 = iter_value_t<_Iter1>;
-	    using _ValueType2 = iter_value_t<_Iter2>;
 	    constexpr bool __use_memcmp
 	      = ((is_integral_v<_ValueType1> || is_pointer_v<_ValueType1>)
 		 && __memcmpable<_Iter1, _Iter2>::__value