travis: workaround bug in environment setup

Travis is poluting the environment, particularly PYTHON_CFLAGS which
makes the build to fail. Just unset the variable since we don't want to
override these cflags.

diff --git a/.travis.yml b/.travis.yml
index 9df2ba8..f3262a5 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ before_install:
   - if [ "$MYCC" = "gcc-4.8" ]; then sudo apt-get install -qq gcc-4.8; sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 90; gcc --version; fi
   - if [ "$MYCC" = "gcc-4.9" ]; then sudo apt-get install -qq gcc-4.9; sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 90; gcc --version; fi
 before_script:
+  - unset PYTHON_CFLAGS # hack to broken travis setup
   - export KDIR="$(find  /lib/modules/* -maxdepth  1 -name build | sort -n --reverse | head -1)"
 matrix:
   include: