syscall(linux):use clone as go instead fork

runtime/internal/clite/os/os.go

@@ -276,6 +276,20 @@ func Getpid() PidT
 //go:linkname Getppid C.getppid
 func Getppid() PidT
 
+// Invoke `system call' number SYSNO, passing it the remaining arguments.
+// This is completely system-dependent, and not often useful.
+
+// In Unix, `syscall' sets `errno' for all errors and most calls return -1
+// for errors; in many systems you cannot pass arguments or get return
+// values for all system calls (`pipe', `fork', and `getppid' typically
+// among them).
+
+// In Mach, all system calls take normal arguments and always return an
+// error code (zero for success).
+//
+//go:linkname Syscall C.syscall
+func Syscall(sysno c.Long, __llgo_va_list ...any) c.Long
+
 //go:linkname Kill C.kill
 func Kill(pid PidT, sig c.Int) c.Int