prlimit64 and sys_getrandom on x86_64 missing

[spacejam]

Thanks for open sourcing this! I really appreciate being able to test my systems with it.

When running on 4.12.8-2 on x86_64 I get these two errors (I just added them to the harmless syscalls array to see if there were any underneath, and this seems to be it):

Parsing traces to determine logical operations ...                                                                             
Traceback (most recent call last):                                                                                             
  File "/home/t/src/alice/_aliceparsesyscalls.py", line 955, in get_micro_ops
    micro_operations += __get_micro_op(syscall_tid, line, stackinfo, mtrace_recorded)                                                                                                                                                                          
  File "/home/t/src/alice/_aliceparsesyscalls.py", line 887, in __get_micro_op                                                 
    raise Exception("Unhandled system call: " + parsed_line.syscall)                                                           
Exception: Unhandled system call: prlimit64

Traceback (most recent call last):                             
  File "/home/t/src/alice/_aliceparsesyscalls.py", line 955, in get_micro_ops                                                  
    micro_operations += __get_micro_op(syscall_tid, line, stackinfo, mtrace_recorded)                                          
  File "/home/t/src/alice/_aliceparsesyscalls.py", line 887, in __get_micro_op                                                 
    raise Exception("Unhandled system call: " + parsed_line.syscall)                                                           
Exception: Unhandled system call: syscall_318