[gcc r11-5575] libstdc++: Add new C++20 headers to Doxygen settings

[Jonathan Wakely]

https://gcc.gnu.org/g:82ac923da681dbde2af1bdb353053ec9ee8ef18b

commit r11-5575-g82ac923da681dbde2af1bdb353053ec9ee8ef18b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Nov 30 15:02:03 2020 +0000

    libstdc++: Add new C++20 headers to Doxygen settings
    
    This doesn't actually have any effect unless you also change the
    predefined value of __cplusplus, as it's currently 201703L. But if
    somebody does want to do that, the new headers will get processed now.
    
    libstdc++-v3/ChangeLog:
    
            * doc/doxygen/user.cfg.in (INPUT): Add <latch> and <semaphore>.

Diff:
---
 libstdc++-v3/doc/doxygen/user.cfg.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index 320f6dea688..1966055e675 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -870,6 +870,7 @@ INPUT                  = @srcdir@/doc/doxygen/doxygroups.cc \
                          include/iostream \
                          include/istream \
                          include/iterator \
+                         include/latch \
                          include/limits \
                          include/list \
                          include/locale \
@@ -887,6 +888,7 @@ INPUT                  = @srcdir@/doc/doxygen/doxygroups.cc \
                          include/ratio \
                          include/regex \
                          include/scoped_allocator \
+                         include/semaphore \
                          include/set \
                          include/shared_mutex \
                          include/span \