Travis-ci is at most on Ubuntu 16.04, that doesn't have openssl >= 1.1,
so disable openssl there.
Semaphore 2.0 was also missing a call to update the package database.
Let's just use autogen.sh, no need for wrapper scripts. Now
`autogen.sh c` uses the same recommended options for developing kmod and
also accepts extra arguments.
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.
Lucas De Marchi
Lucas De Marchi