tests: Tweak installed tests to deal with ASAN

We need to disable readdir-rand there too.

Closes: #622
Approved by: jlebon

tests/libtest.sh

@@ -86,13 +86,16 @@ if test -n "${OT_TESTS_DEBUG:-}"; then
     set -x
 fi
 
+# This is substituted by the build for installed tests
+BUILT_WITH_ASAN=""
+
 if test -n "${OT_TESTS_VALGRIND:-}"; then
     CMD_PREFIX="env G_SLICE=always-malloc OSTREE_SUPPRESS_SYNCFS=1 valgrind -q --error-exitcode=1 --leak-check=full --num-callers=30 --suppressions=${test_srcdir}/glib.supp --suppressions=${test_srcdir}/ostree.supp"
 else
     # In some cases the LD_PRELOAD may cause obscure problems,
     # e.g. right now it breaks for me with -fsanitize=address, so
     # let's allow users to skip it.
-    if test -z "${OT_SKIP_READDIR_RAND:-}"; then
+    if test -z "${OT_SKIP_READDIR_RAND:-}" && test -z "${BUILT_WITH_ASAN:-}"; then
 	CMD_PREFIX="env LD_PRELOAD=${test_builddir}/libreaddir-rand.so"
     else
 	CMD_PREFIX=""