Fix travis build

Use never version of gcc 4.8

.travis.yml

@@ -1,9 +1,13 @@
 
 language: c
 compiler: gcc
+sudo: required
+dist: trusty
 
 install:
     - uname -a
+    - sudo dpkg --add-architecture i386
+    - sudo rm /var/lib/apt/lists/* -vf
     - sudo apt-get update -qq
     - sudo apt-get install -qq cmake gcc-multilib libc6:i386 libgcc1:i386
     - wget https://launchpad.net/gcc-arm-embedded/4.9/4.9-2015-q3-update/+download/gcc-arm-none-eabi-4_9-2015q3-20150921-linux.tar.bz2