LUCY-157 Add -pthread link flag on OpenBSD.
LUCY-157 Add -pthread link flag on OpenBSD.

OpenBSD has userland pthreads.  If we don't supply the "-pthread" flag to the
linker, then lazy binding of symbols from pthread.h fails.

git-svn-id: 0e6074679e66e8f1cc73dfc755b08bab367f805b@1134953 13f79535-47bb-0310-9956-ffa450edef68

rectang/lucy,pombredanne/apache-lucy,pombredanne/apache-lucy,nwellnhof/lucy,apache/lucy,rectang/lucy,rbevers/lucy,nwellnhof/lucy,pombredanne/apache-lucy,apache/lucy,rbevers/lucy,kidaa/lucy,apache/lucy,rectang/lucy,kidaa/lucy,apache/lucy,kidaa/lucy,pombredanne/apache-lucy,nwellnhof/lucy,kidaa/lucy,rbevers/lucy,nwellnhof/lucy,pombredanne/apache-lucy,kidaa/lucy,rbevers/lucy,rectang/lucy,nwellnhof/lucy,kidaa/lucy,rectang/lucy,nwellnhof/lucy,apache/lucy,nwellnhof/lucy,pombredanne/apache-lucy,kidaa/lucy,kidaa/lucy,apache/lucy,rectang/lucy,rbevers/lucy,apache/lucy,pombredanne/apache-lucy,rbevers/lucy,rectang/lucy,rbevers/lucy