run-tests: use OSX/BSD compatible `mktemp -d`

-d requires an arg on BSD

diff --git a/tests/run-tests b/tests/run-tests
index f7acd069fc0ad271f3bf46656871e5f041bfe088..5efed6807814925daa7d9da7ab06a1d521fac558 100755 (executable)
--- a/tests/run-tests
+++ b/tests/run-tests
@@ -33,7 +33,7 @@ create_fake_android_home() {
 
 create_test_dir() {
     test -e $WORKSPACE/.testfiles || mkdir $WORKSPACE/.testfiles
-    TMPDIR=$WORKSPACE/.testfiles  mktemp -d
+    mktemp -d $WORKSPACE/.testfiles/run-tests.XXXX
 }
 
 create_test_file() {