File nss-allow-slow-tests-s390x.patch of Package mozilla-nss

On s390x, this test takes more than 6 seconds (build log says 12 seconds)

--- nss/tests/dbtests/dbtests.sh.orig	2023-12-26 16:48:17.186506407 +0100
+++ nss/tests/dbtests/dbtests.sh	2023-12-26 16:49:13.323116874 +0100
@@ -367,7 +367,7 @@ dbtest_main()
       TIMEARRAY=(${RARRAY[1]//./ })
       echo "${TIMEARRAY[0]} seconds"
       # Was 5, but that is too small for OBS-workers.
-      test ${TIMEARRAY[0]} -lt 6
+      test ${TIMEARRAY[0]} -lt 15
       ret=$?
       html_msg ${ret} 0 "certutil dump keys with explicit default trust flags"
     fi