recipes-core: Add musl OpenHarmony compatibility patches

Add OpenHarmony compatibility patches to musl. This is a port of the OpenHarmony 3.1 patches as found in https://gitlab.eclipse.org/esben/meta-openharmony/-/tree/wip/oh-3.1/recipes-core/musl commit d06ff8b5d165b862298a756799dbc641cb68b1c5 to current musl.

The patches should be harmless. Their effects:

• Add OpenHarmony's malloc hook mechanism
• Add stubs for mallinfo() and mallinfo2() [currently not implemented by musl]
• Mark memory allocated by musl malloc with PR_SET_VMA_ANON_NAME
• Add a gettid/pthread_gettid_np implementation
• Increase SHMLBA size
• Add namespaced dlopen APIs
• Implement sched_getparam(), sched_getscheduler() and sched_setscheduler() [Linux only]
• small tweaks and optimizations

The patches don't look like they will cause trouble.

If there is anything that uses mallinfo() or mallinfo2() with autoconf/cmake/meson checks (didn't find anything at a quick look), we might want to disable those stubs - not having those calls is preferable over having them return bogus values).

Signed-off-by: Bernhard Rosenkränzer bernhard.rosenkraenzer.ext@huawei.com