doxygen: fix build for gcc 12

srcpkgs/doxygen/patches/compat-gcc12.patch

@@ -0,0 +1,22 @@
+From 5198966c8d5fec89116d025c74934ac03ea511fa Mon Sep 17 00:00:00 2001
+From: Dimitri van Heesch <doxygen@gmail.com>
+Date: Fri, 6 May 2022 09:55:16 +0200
+Subject: [PATCH] issue #9312: Build: cache.h:53:14: error: 'exchange' is not a
+ member of 'std'
+
+---
+ src/cache.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/cache.h b/src/cache.h
+index 0ff3092ed5..e218eb27d2 100644
+--- a/src/cache.h
++++ b/src/cache.h
+@@ -19,6 +19,7 @@
+ #include <list>
+ #include <unordered_map>
+ #include <mutex>
++#include <utility>
+ #include <ctype.h>
+ 
+ /*! Fixed size cache for value type V using keys of type K.