Set rlimits on OS X. Enable tests on OSX (except valgrind). setrlimit error handling.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3209 ed5197a5-7fde-0310-b194-c3ffbd925b24

tests/02-valgrind

@@ -1,5 +1,10 @@
 #!/bin/bash
 
+if [ ! -x /usr/bin/valgrind ]; then
+	echo "SKIP"
+	exit 0
+fi
+
 cat > test.js << EOF
 print("hi");
 EOF