gnu: gourmet: Update to 0.17.4-0-8af29c8 and enable tests.
* gnu/packages/patches/gourmet-sqlalchemy-compat.patch: Add file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/nutrition.scm (gourmet): Update to 0.17.4-0-8af29c8.
[source]: Apply patch.
[python]: Delete argument.
[tests?]: Likewise.
[phases]{prepare-x}: New phase.
{check}: New phase override.
{install-dekstop-file-and-icons}: New phase.
[native-inputs]: Delete python2-distutils-extra, intltool and python2-pygtk.
Add python-dogtail, python-pytest, python-selenium and xorg-server-for-tests.
[inputs]: Delete python2-pygtk, python2-sqlalchemy, python2-lxml,
python2-pillow and python2-elib.intl.
Add gtk+, python-argcomplete, python-beautifulsoup4, python-gst,
python-keyring, python-lxml, python-pillow, python-pycairo, python-pyenchant,
python-pygobject, python-requests, python-scrape-schema-recipe,
python-sqlalchemy.
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