travis-ci: upgrade version number of nginx CORE, remove clang compile…#19

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zhuizhuhaomeng merged 1 commit intoopenresty:masterfrom

xiaocang:update-travis

Jan 9, 2022

Commits on Jul 8, 2021

travis-ci: upgrade version number of NGINX core, remove clang compiler mode from travis to save credits.
jiahao
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