ostree-tests: Remove gjs dependency on s390x

mozjs60 doesn't work on s390x, so gjs is in danger of being removed from
that architecture (see #909536). The test that uses JS is automatically
skipped if the interpreter is missing.

debian/changelog

@@ -1,3 +1,12 @@
+ostree (2018.8-2) UNRELEASED; urgency=medium
+
+  * ostree-tests: Remove gjs dependency on s390x.
+    mozjs60 doesn't work on s390x, so gjs is in danger of being removed
+    from that architecture (see #909536). The test that uses JS is
+    automatically skipped if the interpreter is missing.
+
+ -- Simon McVittie <smcv@debian.org>  Thu, 27 Sep 2018 19:45:55 +0100
+
 ostree (2018.8-1) unstable; urgency=medium
 
   * New upstream release