[Merge] ~mitya57/compiz:s390x-test into compiz:master

[Dmitry Shachnev]

The proposal to merge ~mitya57/compiz:s390x-test into compiz:master has been updated.

Description changed to:

Use unsigned long for getting/setting _NET_WM_USER_TIME property

The XChangeProperty / XGetWindowProperty man page says:

> If the specified format is 32, the property data must be a long array.

and:

> If the returned format is 32, the returned data is represented as a long
> array and should be cast to that type to obtain the elements.

This fixes the test failure on s390x.

Thanks to Jakub Jelinek for pointing me to it!

For more details, see:
https://code.launchpad.net/~mitya57/compiz/+git/compiz/+merge/389101
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