[Boost-build] Cleanup execunix.c

Subject: [Boost-build] Cleanup execunix.c
From: K. Noel Belcourt (kbelco_at_[hidden])
Date: 2010-01-05 18:13:58

Hi,

The attached patch ensures we close both file descriptors following  
the dup2 call.  This is mostly for completeness but also because I've  
occasionally noticed output isn't flushed from a terminated process  
(when it is killed for exceeding the time limit).  I'm sure this  
won't break anything and am slightly hopeful that it might ensure  
output is flushed before the terminating process is killed.

Look reasonable?

-- Noel