GH-9157: opcache fix build on older macOs releases.

Closes #9158.

Author: devnexen

configure.ac

@@ -398,6 +398,7 @@ langinfo.h \
 linux/filter.h \
 linux/sock_diag.h \
 malloc.h \
+os/signpost.h \
 poll.h \
 pty.h \
 pwd.h \

ext/opcache/jit/zend_jit_perf_dump.c

@@ -26,7 +26,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
-#if !defined(__APPLE__)
+#if !defined(HAVE_OS_SIGNPOST_H)
 #if defined(__linux__)
 #include <sys/syscall.h>
 #elif defined(__darwin__)