* gc.c (getrusage_time): Fallback clock_gettime to getrusage when
  clock_gettime fails.
  Reported by Eric Saxby.  [ruby-core:56762] [Bug #8805]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42639 b2dd03c8-39d4-4d8f-98ff-823fe69b080e