Do not add -latomic ever; macOS does not have it, not even on ARM.
Reverts https://github.com/openswoole/swoole-src/commit/63d95ec9ea3d9e1de5d78cc705b8da04cfd42f7f
Only affects PHP 7.3.x and earlier.
https://github.com/openswoole/swoole-src/issues/131
--- config.m4.orig	2022-01-24 16:16:52.000000000 -0600
+++ config.m4	2022-01-24 20:16:13.000000000 -0600
@@ -832,11 +832,6 @@
         AC_DEFINE(SW_USE_ASM_CONTEXT, 1, [use boost asm context])
     fi
 
-    # 32-bit ARM
-    if test "$SW_CPU" = "arm"; then
-        PHP_ADD_LIBRARY(atomic, 1, OPENSWOOLE_SHARED_LIBADD)
-    fi
-
     PHP_NEW_EXTENSION(openswoole, $swoole_source_file, $ext_shared,, "$EXTRA_CFLAGS -DENABLE_PHP_SWOOLE", cxx)
 
     PHP_ADD_INCLUDE([$ext_srcdir])