[BUILD] Remove deprecated sys_siglist to avoid build failure with GLIBC2.35.

Author: liutongxuan

serving/third_party/libapr1.patch

@@ -1872,3 +1872,16 @@ diff -urN include/private/apr_escape_test_char.h libapr/include/private/apr_esca
 +    222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,
 +    222,222,222,222,222,222,222,222,222,222,222,222,222,222,222,222 
 +};
+diff --git a/threadproc/unix/signals.c b/threadproc/unix/signals.c
+index 57a31af..20ca5ae 100644
+--- a/threadproc/unix/signals.c
++++ b/threadproc/unix/signals.c
+@@ -116,7 +116,7 @@ void apr_signal_init(apr_pool_t *pglobal)
+ }
+ const char *apr_signal_description_get(int signum)
+ {
+-    return (signum >= 0) ? sys_siglist[signum] : "unknown signal (number)";
++    return (signum >= 0) ? strsignal(signum) : "unknown signal (number)";
+ }
+
+ #else /* !(SYS_SIGLIST_DECLARED || HAVE_DECL_SYS_SIGLIST) */