Remove explicit SIGCHLD handling. (#7816)

* Remove unused SIGCHLD handling.

* Remove unused `init_sigchld`.

* Remove unnecessary `#define RUBY_SIGCHLD (0)`.

* Remove unused `SIGCHLD_LOSSY`.

1 files changed, 1 insertions, 1 deletions

diff --git a/thread.c b/thread.c
index 60b5ce1af6..2d255beaec 100644
--- a/thread.c
+++ b/thread.c
@@ -4511,7 +4511,7 @@ check_signals_nogvl(rb_thread_t *th, int sigwait_fd)
         else {
             threadptr_trap_interrupt(vm->ractor.main_thread);
         }
-        ret = TRUE; /* for SIGCHLD_LOSSY && rb_sigwait_sleep */
+        ret = TRUE; /* for rb_sigwait_sleep */
     }
     return ret;
 }