test: fix build for macOS Sequoia 15.0

When build <tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c> on
macOS Sequoia 15.0б, I've got the following error from including
<sys/ptrace.h>:

| error: unknown type name 'caddr_t'
| int     ptrace(int _request, pid_t _pid, caddr_t _addr, int _data);

It can be fixed by including <sys/types.h>, but since this test is
skipped for macOS anyway, I prefer just to move all necessary includes
under the corresponding define.

test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c

@@ -5,12 +5,6 @@
 #include "test.h"
 #include "utils.h"
 
-#include <signal.h>
-#include <sys/ptrace.h>
-#include <sys/user.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
 /* XXX: Still need normal assert inside <tracee> and helpers. */
 #undef NDEBUG
 #include <assert.h>
@@ -24,6 +18,12 @@
 
 #if LUAJIT_OS == LUAJIT_OS_LINUX && LUAJIT_TARGET == LUAJIT_ARCH_X64
 
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <sys/user.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
 /*
  * XXX: The test makes sysprof collect the particular event
  * (FFUNC) at the particular instruction (<lj_fff_res1>) to