[gcc r11-11545] libstdc++: fix typo in acinclude.m4.

[Jonathan Wakely]

https://gcc.gnu.org/g:6e33ffd543257a1a599b51201e9db95b070dbf84

commit r11-11545-g6e33ffd543257a1a599b51201e9db95b070dbf84
Author: Martin Liska <mliska@suse.cz>
Date:   Thu Jan 27 14:47:23 2022 +0100

    libstdc++: fix typo in acinclude.m4.
    
            PR libstdc++/104259
    
    libstdc++-v3/ChangeLog:
    
            * acinclude.m4: Fix typo.
            * configure: Regenerate.
    
    (cherry picked from commit 14f339894db6ca7fe4772d5528c726694d2517c4)

Diff:
---
 libstdc++-v3/acinclude.m4 | 2 +-
 libstdc++-v3/configure    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 696756a6df6..e2a12607d5d 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -4834,7 +4834,7 @@ dnl
       [glibcxx_cv_fdopendir=yes],
       [glibcxx_cv_fdopendir=no])
   ])
-  if test $glibcxx_cv_truncate = yes; then
+  if test $glibcxx_cv_fdopendir = yes; then
     AC_DEFINE(HAVE_FDOPENDIR, 1, [Define if fdopendir is available in <dirent.h>.])
   fi
 dnl
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 316c19a2c95..64f2552afe5 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -76851,7 +76851,7 @@ fi
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_fdopendir" >&5
 $as_echo "$glibcxx_cv_fdopendir" >&6; }
-  if test $glibcxx_cv_truncate = yes; then
+  if test $glibcxx_cv_fdopendir = yes; then
 
 $as_echo "#define HAVE_FDOPENDIR 1" >>confdefs.h