On illumos it is not possible to remove current working directory of current
process.  See also https://www.illumos.org/issues/16562

--- libsecret-0.21.4/tool/test-secret-tool.sh.orig
+++ libsecret-0.21.4/tool/test-secret-tool.sh
@@ -6,6 +6,7 @@
 test -d "$testdir" || mkdir "$testdir"
 
 cleanup () {
+	cd ..
 	rm -rf "$testdir"
 }
 trap cleanup 0