.travis.yml: try to fix gcc 4.8 config by updating to xenial#1360

Merged

rouault merged 1 commit intouclouvain:masterfrom rouault:travis_gcc_4_8_fix

Jun 7, 2021

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Commits on Jun 7, 2021

.travis.yml: try to fix gcc 4.8 config by updating to xenial
rouault
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