Update syscalls_cpp.cpp

fix: 无法识别pid_t类型错误 error: unknown type name ‘pid_t’
https://blog.csdn.net/m0_47634756/article/details/121243320

os/various/cpp_wrappers/syscalls_cpp.cpp

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <errno.h>
-
+#include <unistd.h>
+#include <sys/types.h>
 #include "osal.h"
 
 #include "syscalls_cpp.hpp"