removed embree from python build on linux

Former-commit-id: c73ec2dd75e754097aadfd28b7853578c18bbf9e

.travis.yml

@@ -11,7 +11,7 @@ matrix:
         - cd python
         - mkdir build
         - cd build
-        - cmake -DCMAKE_CXX_COMPILER=g++-4.8 -DCMAKE_C_COMPILER=gcc-4.8 ../
+        - cmake -DCMAKE_CXX_COMPILER=g++-4.8 -DCMAKE_C_COMPILER=gcc-4.8 -DLIBIGL_WITH_EMBREE=OFF ../
         - make -j 2
         - cd ../../
         - cd tutorial