Cannot compile tests on macos

[db7]

The tests in libvsync depend on several Linux specific features, making them non-portable. I believe that is unnecessary, since the library itself should work on other POSIX systems (and most of it should also work on non-POSIX systems).

The issues I’ve found are:

• dependency on sys/sysinfo.h
• use of non-standard sched_setaffinity
• use of non-standard getrandom
• inttypes.h (although here I am unsure about the reason)

If we could get rid of these dependencies, the test cases would be more portable and run on other POSIX systems like macOS.

[db7]

I have removed the dependency on sys/sysinfo.h and the call to sched_setaffinity and then only these tests to fail to compile:

The following tests FAILED:                                                                                                                                     
         13 - core-vatomic8_write (Not Run)                                                                                                                     
        176 - test_ut_bitmap (Not Run)                                                                                                                          
        193 - bounded_mpmc_check_full (Not Run)                                                                                                                 
        197 - ut_test_simple (Not Run)                                                                                                                          
        288 - test_case_8_listset_fine (Not Run)                                                                                                                
        308 - test_test_case_popped_once_stack_xbo_backoff (Not Run)                                                                                            
        310 - cnd_test1 (Not Run)                                                                                                                               
        311 - cnd_test2 (Not Run)                                                                                                                               
        312 - mutex_musl (Not Run)                                                                                                                              
        313 - mutex_slim (Not Run)                                                                                                                              
        314 - mutex_tristate (Not Run)                                                                                                                          
        315 - once (Not Run)                      

I'll investigate that in more detail the reason for each of them, but the last 6 must be failing because of futex interface.

[db7]

Ok, I got all tests to compile and run. We just need 4 minor changes. I'll create a MR for it soon.