Sun 2 Jun 2019 : replaced pragma Interface with pragma Import in 
  unix_resource_usage.adb, removing obsolescent feature.

Sat 30 Sep 2017 : added array_of_duration to timing_package.ads.

Sun 29 May 2011 : for warnings, changed unix_resource_usage.adb.

Mon 1 Jun 2009 : fixed unix_resource_usage.ad* for x86_64.

Sun 31 May 2009 : using long_integer on x86_64 for definition in timeval
  makes crash go away.

Thu 3 Jan 2008 : because of warnings given by GNAT GPL 2006, changed
   unix_resource_usage.a* and timing_package.a*.

Wed 2 Jan 2008 : changed timing_package.adb because warnings in GNAT GPL 2006.
