[gcc r14-11541] libstdc++: Add new header to Doxygen config file

[Jonathan Wakely]

https://gcc.gnu.org/g:7e789f34206f29ae501ddba87faf0e73658a4c5c

commit r14-11541-g7e789f34206f29ae501ddba87faf0e73658a4c5c
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Apr 3 15:36:08 2025 +0100

    libstdc++: Add new header to Doxygen config file
    
    libstdc++-v3/ChangeLog:
    
            * doc/doxygen/user.cfg.in (INPUT): Add text_encoding.
    
    (cherry picked from commit 5430fcd1a3222d62c1b9560de251268c8bc50303)

Diff:
---
 libstdc++-v3/doc/doxygen/user.cfg.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index 8fe337adf751..5672c207accd 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -906,6 +906,7 @@ INPUT                  = @srcdir@/doc/doxygen/doxygroups.cc \
                          include/string_view \
                          include/syncstream \
                          include/system_error \
+                         include/text_encoding \
                          include/thread \
                          include/tuple \
                          include/typeindex \