Add and use a configure test to determine if this is an NPTL based
system.  Hopefully this will allow it to build out of the box and
(sort-of) work on RH9.

MERGE TO STABLE (if it works)


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@1511 a5019735-40e9-0310-863c-91ae7b9d1cf9
2 files changed