Add mips64el to the list of platforms that are allowed to fail test suite (Closes: #879637)

debian/rules

@@ -32,7 +32,7 @@ else
 endif
 
 # Ignore test suite exit code on unstable platforms
-ifeq ($(DEB_HOST_ARCH),$(filter $(DEB_HOST_ARCH),mips mipsel alpha powerpc sh4 hurd-i386))
+ifeq ($(DEB_HOST_ARCH),$(filter $(DEB_HOST_ARCH),mips mipsel mips64el alpha powerpc sh4 hurd-i386))
     TESTSUITE_FAIL_CMD:=true
 else
     TESTSUITE_FAIL_CMD:=exit 1