[gcc r11-9901] libstdc++: Fix macro checked by test

[Jonathan Wakely]

https://gcc.gnu.org/g:57f658fe8459a285c89b9ea72ff1411a8c733632

commit r11-9901-g57f658fe8459a285c89b9ea72ff1411a8c733632
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Apr 20 13:50:14 2022 +0100

    libstdc++: Fix macro checked by test
    
    The macro being tested here is wrong, but just happens to have the same
    value as the one supposed to be tested.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc:
            Check correct feature test macro.
    
    (cherry picked from commit 67ded3a1f5b667b4cb5eb2fee8a031e8e4060a7d)

Diff:
---
 .../21_strings/basic_string_view/operations/copy/char/constexpr.cc      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc b/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
index f467d114c24..7ae3ccda22f 100644
--- a/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
+++ b/libstdc++-v3/testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc
@@ -22,7 +22,7 @@
 
 #ifndef __cpp_lib_constexpr_string_view
 # error "Feature test macro for constexpr copy is missing in <string_view>"
-#elif __cpp_lib_constexpr_iterator < 201811L
+#elif __cpp_lib_constexpr_string_view < 201811L
 # error "Feature test macro for constexpr copy has wrong value in <string_view>"
 #endif