Add calls that were added in 10.7

[andrewdavidmackenzie]

for proc_pid.rs:

// Added in 10.7
// int proc_listallpids(void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_1);
// int proc_listpgrppids(pid_t pgrpid, void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_1);
// int proc_listchildpids(pid_t ppid, void * buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_1);
// int proc_pidfileportinfo(int pid, uint32_t fileport, int flavor, void *buffer, int buffersize) __OSX_AVAILABLE_STARTING(__MAC_10_7, __IPHONE_4_3);