* Make sure we're using GNU sed; install can otherwise fail

* when getting the gcc version number, be robust to strings like
  "gcc.orig (GNU) 3.3.3" -- previous pattern was fooled by the dot
  in "gcc.orig"



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8442 a5019735-40e9-0310-863c-91ae7b9d1cf9
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