[bug #46261] missing usage of EINTRLOOP macro

[Paul D. Smith]

Update of bug #46261 (project make):

                  Status:                    None => Fixed                  
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 
           Fixed Release:                    None => SCM                    
           Triage Status:                    None => Medium Effort          

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Follow-up Comment #12:

I modified the implementation of the jobserver function to use pselect() on
systems where it's supported.  This avoids the EINTR problem as it allows us
to block SIGCHLD throughout the process except for (atomically) within the
pselect() system call itself, so we know we won't lose signals.

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