Update travis to test 32bit

Jan Breuer

2015-10-04 4dadcefcd8ee24203f07bbe00d5c4178e3db19ad

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addons:
  apt:
    packages:
    - libcunit1-dev
 
sudo: false
 
script:
    - make test
    - CFLAGS="-m32" LDFLAGS="-m32" make clean test