Add SDL to the travis script.#1002

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SiegeLord wants to merge 3 commits intoliballeg:masterfrom

SiegeLord:sdl_travis

Commits on Feb 7, 2019

Add SDL to the travis script.

SiegeLordEx
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SiegeLord
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Don't run the install test with SDL, as there's no dialog addon.

SiegeLordEx
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SiegeLord
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Commits on Feb 8, 2019

Fix it
SiegeLord
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