package/uclibc: add patch for libucontext usage

*ucontext functions are only implemented for a subset of
uClibc supported architectures. To allow the external library
libucontext to be used this small patch is required.
Tested for riscv64.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f761a8c451)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/uclibc/0001-allow-to-use-sys-ucontext.h.patch

@@ -0,0 +1,35 @@
+From 903da45dde43836e35a295226c5b1efccd413c08 Mon Sep 17 00:00:00 2001
+From: Waldemar Brodkorb <wbx@openadk.org>
+Date: Wed, 17 Jul 2024 15:41:40 +0200
+Subject: [PATCH] allow to use <sys/ucontext.h>
+
+For architectures without ucontext implementation it is possible
+to use libucontext with this small adaptation.
+
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+Upstream: https://mailman.openadk.org/mailman3/hyperkitty/list/devel@uclibc-ng.org/thread/MZCPGG56TL7SVOZY2L3AGHLREJ76BYZE/
+---
+ include/ucontext.h | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/include/ucontext.h b/include/ucontext.h
+index 4ce114ef1..76b4f375e 100644
+--- a/include/ucontext.h
++++ b/include/ucontext.h
+@@ -23,11 +23,11 @@
+ 
+ #include <features.h>
+ 
+-#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__
+-
+ /* Get machine dependent definition of data structures.  */
+ #include <sys/ucontext.h>
+ 
++#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__
++
+ __BEGIN_DECLS
+ 
+ /* Get user context and store it in variable pointed to by UCP.  */
+-- 
+2.30.2
+