[travis] enable Python layer for testing

scripts/travis/travis_setup_makefile_config.sh

@@ -19,4 +19,5 @@ PYTHON_INCLUDE := $(ANACONDA_HOME)/include \
 PYTHON_LIB := $(ANACONDA_HOME)/lib
 INCLUDE_DIRS := $(PYTHON_INCLUDE) /usr/local/include
 LIBRARY_DIRS := $(PYTHON_LIB) /usr/local/lib /usr/lib
+WITH_PYTHON_LAYER := 1
 EOF