Fix Linux LibC.Sysinfo FieldOrder

[dbwiddis]

Fixes #1027.

Committing build.xml patch first to generate test failure before fixing it.

[dbwiddis]

New build.xml confirmed Linux test failure:

[junit] Structure.getFieldOrder() on class com.sun.jna.platform.linux.LibC$Sysinfo does not provide enough names [13] ([_f, bufferram, freehigh, freeram, freeswap, loads, mem_unit, procs, sharedram, totalhigh, totalram, totalswap, uptime]) to match declared fields [12] ([bufferram, freehigh, freeram, freeswap, loads, mem_unit, procs, sharedram, totalhigh, totalram, totalswap, uptime])

[dbwiddis]

Well, Linux test passes but Mac is failing with the new build for other reasons that I don't quite understand...

[dbwiddis]

Seems to be running (and failing) the Unix tests on Mac.

[matthiasblaesing]

Please change this line to read:

      <and>
        <os family="unix"/>
        <not><os family="mac"/></not>
      </and>

That way the unix tests are not run on Mac OS (as it was before the change)

[matthiasblaesing]

Thank you for updating the PR, could you please revert the changes to the toplevel build.xml? Only whitespace is changed and is not necessary and hinders readability.

[dbwiddis]

Sure, I'll undo it... sorry, ended up editing the wrong build.xml trying to fix a tab-to-spaces thing.

[dbwiddis]

OK, I think I have it fixed now. Editing on Notepad++ pre-coffee was maybe not the smartest thing to do.

[matthiasblaesing]

Thank you. I merged the commits via:
475ae60
41d5123

I squashed the testing updates together and updated the changelog to point to issues, where issues exist.