package/pistache: fix build with gcc 11

Fix the following build failure with gcc 11:

In file included from /tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/../include/pistache/async.h:10,
                 from /tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/../include/pistache/client.h:9,
                 from /tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/client/client.cc:7:
/tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/../include/pistache/typeid.h:26:12: error: expected type-specifier before 'size_t'
   26 |   operator size_t() const { return reinterpret_cast<size_t>(id_); }
      |            ^~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/2443559df8c2357476e4cbdbebb08280cbb80a3b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/pistache/0003-include-pistache-typeid.h-include-cstddef.patch

@@ -0,0 +1,38 @@
+From 37291201ed948e9d65993a717c59bb14f4187e13 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Thu, 5 Aug 2021 19:02:56 +0200
+Subject: [PATCH] include/pistache/typeid.h: include cstddef
+
+Include cstddef to avoid the following build failure with gcc 11:
+
+In file included from /tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/../include/pistache/async.h:10,
+                 from /tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/../include/pistache/client.h:9,
+                 from /tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/client/client.cc:7:
+/tmp/instance-3/output-1/build/pistache-f2f5a50fbfb5b8ef6cf1d3d2a9d442a8270e375d/src/../include/pistache/typeid.h:26:12: error: expected type-specifier before 'size_t'
+   26 |   operator size_t() const { return reinterpret_cast<size_t>(id_); }
+      |            ^~~~~~
+
+Fixes:
+ - http://autobuild.buildroot.org/results/2443559df8c2357476e4cbdbebb08280cbb80a3b
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/pistacheio/pistache/pull/965]
+---
+ include/pistache/typeid.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/include/pistache/typeid.h b/include/pistache/typeid.h
+index 10353ca..893e7c1 100644
+--- a/include/pistache/typeid.h
++++ b/include/pistache/typeid.h
+@@ -7,6 +7,7 @@
+ 
+ #pragma once
+ 
++#include <cstddef>
+ #include <functional>
+ 
+ namespace Pistache
+-- 
+2.30.2
+