debian: replace build line with a override_dh_auto_build line
This is more in line with how dh is supposed to work. In particular,
dh_auto_build is functionally equivalent to the repeated "dh build
--with python2 --buildsystem=python_distutils" used currently.
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico