travis-ci: Migrating to Trusty CI env

.travis.yml

@@ -1,7 +1,8 @@
+sudo: required
+dist: trusty
 language: c
 
 before_install:
-  - sudo add-apt-repository -y ppa:waja/precise-backports
   - sudo apt-get update -qq
   - sudo apt-get purge -qq gawk
   # ensure we have a test database in place for tests