package/cpulimit: Backport fix for function signature

Backport the upstream pull request patch fixing the incorrect function
signature passed to pthread_create()

Fixes: https://autobuild.buildroot.org/results/5308cb8239f31ef39e5c67d65ff1d69cdec1cedc
Fixes: https://autobuild.buildroot.org/results/6722247e3c830558ac0377352d05f4bb1684978d
Fixes: https://autobuild.buildroot.org/results/adc385fe35432be28453b8ed9f40e8a6647a4b28
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
[Julien: reformat patch "Upstream:" tag to fix check-package error]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/cpulimit/0005-Correct-loop-function-signature.patch

@@ -0,0 +1,49 @@
+From 74e95c96e8d82e4e374f86142972fcf4305fe1f2 Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <f.fainelli@gmail.com>
+Date: Wed, 2 Jul 2025 20:47:58 -0700
+Subject: [PATCH] Correct loop function signature
+
+loop is passed to pthread_create() which requires the following
+prototype to be used: void *(*start_routine) (void *)
+
+Correct the signature to avoid such warnings:
+
+In file included from busy.c:3:
+/home/buildroot/instance-0/output-1/host/mips-buildroot-linux-uclibc/sysroot/usr/include/pthread.h:164:36: note: expected 'void * (*)(void *)' but argument is of type 'void * (*)(void)'
+  164 |                            void *(*__start_routine) (void *),
+      |                            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
+busy.c:6:7: note: 'loop' declared here
+    6 | void *loop()
+      |       ^~~~
+
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+Upstream: https://github.com/opsengine/cpulimit/pull/127
+---
+ tests/busy.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/tests/busy.c b/tests/busy.c
+index b3afb7cd853b..93f0bcce67a8 100644
+--- a/tests/busy.c
++++ b/tests/busy.c
+@@ -3,7 +3,7 @@
+ #include <pthread.h>
+ #include <unistd.h>
+ 
+-void *loop()
++void *loop(void *)
+ {
+ 	while(1);
+ }
+@@ -23,7 +23,7 @@ int main(int argc, char **argv) {
+ 			exit(1);
+ 		}
+ 	}
+-	loop();
++	loop(NULL);
+ 	return 0;
+ }
+ 
+-- 
+2.43.0
+