NPOTB travis-ci: address warnings / info. (#1311)

* Update .travis.yml

* travis-ci: test cache folder damage.

* travis-ci: cache invalidates checkout-deps.

.travis.yml

@@ -1,23 +1,21 @@
 git:
   depth: 3
 
-sudo: false
 language: cpp
+os: linux
+dist: xenial
 
-matrix:
+jobs:
   fast_finish: true
   include:
     - os: linux
       dist: trusty
-      sudo: false
       language: cpp
       addons:
         apt:
           sources:
             - ubuntu-toolchain-r-test
           packages: ['clang-3.8', 'lib32stdc++6', 'lib32z1-dev', 'libc6-dev-i386', 'linux-libc-dev:i386', 'g++-4.9-multilib']
-        cache:
-          directories: ['../mysql-5.0']
       env:
         - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"
         - SDKS=episode1,css,tf2,l4d2,csgo,dota
@@ -26,15 +24,12 @@ matrix:
 
     - os: linux
       dist: trusty
-      sudo: false
       language: cpp
       addons:
         apt:
           sources:
             - ubuntu-toolchain-r-test
           packages: ['clang-3.4', 'lib32stdc++6', 'lib32z1-dev', 'libc6-dev-i386', 'linux-libc-dev:i386', 'g++-4.9-multilib']
-        cache:
-          directories: ['../mysql-5.0']
       env:
         - MATRIX_EVAL="CC=clang && CXX=clang++"
         - SDKS=episode1,css,tf2,l4d2,csgo,dota
@@ -69,13 +64,10 @@ matrix:
     # This is a faster test for the latest clang.
     - os: linux
       dist: bionic
-      sudo: false
       language: cpp
       addons:
         apt:
           packages: ['lib32stdc++6', 'lib32z1-dev', 'libc6-dev-i386', 'linux-libc-dev:i386', 'g++-multilib', 'clang']
-        cache:
-          directories: ['../mysql-5.0']
       env:
         - MATRIX_EVAL="CC=clang && CXX=clang++"
         - SDKS=csgo

pushbuild.txt

@@ -74,3 +74,4 @@ the mousse angles are smooth
 spoilers
 oh key you're so good to me
 well, ok rude
+travis stole my shoe, once.