travis: update mesalink build to xenial

Closes https://github.com/curl/curl/pull/3842

diff --git a/.travis.yml b/.travis.yml
index d4b848c8d1962d145a3c6f9ae7a7988037a6b593..3ea0201605ca52eada4add5fec56601c798c52ff 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -116,7 +116,7 @@ matrix:
                       - libpsl-dev
         - os: linux
           compiler: gcc
-          dist: trusty
+          dist: xenial
           env:
               - T=debug-mesalink C="--with-mesalink --without-ssl"
               - OVERRIDE_CC="CC=gcc-8" OVERRIDE_CXX="CXX=g++-8"