add some more yum repos

.travis.yml

@@ -1,5 +1,8 @@
 language: c
 before_install:
+    - echo "yes" | sudo add-apt-repository "deb http://archive.ubuntu.com/ubuntu `lsb_release -sc` main universe restricted multiverse"
+    - echo "yes" | sudo apt-add-repository ppa:openmw/deps
+    - sudo apt-get update -qq
     - sudo apt-get install mingw32 libsdl2-static-dev
 script:
     - which crossdev