5.15-stable patches

5.15-stable patches

added patches:
	exit-syscall_user_dispatch-send-ordinary-signals-on-failure.patch
	signal-don-t-always-set-sa_immutable-for-forced-signals.patch
	signal-implement-force_fatal_sig.patch
	signal-powerpc-on-swapcontext-failure-force-sigsegv.patch
	signal-replace-force_fatal_sig-with-force_exit_sig-when-in-doubt.patch
	signal-replace-force_sigsegv-sigsegv-with-force_fatal_sig-sigsegv.patch
	signal-s390-use-force_sigsegv-in-default_trap_handler.patch
	signal-sparc32-exit-with-a-fatal-signal-when-try_to_clear_window_buffer-fails.patch
	signal-sparc32-in-setup_rt_frame-and-setup_fram-use-force_fatal_sig.patch
	signal-vm86_32-properly-send-sigsegv-when-the-vm86-state-cannot-be-saved.patch
	signal-x86-in-emulate_vsyscall-force-a-signal-instead-of-calling-do_exit.patch