[brand] !!DO NOT MERGE!! this patch uses branch fix-searx.sh @return42

Do not merge this patch in master branch of SearXNG!  This branch exists only
for testing the feature branch fix-searx.sh @return42.

This patch changes the buildenv to::

    GIT_URL='https://github.com/return42/searxng'
    GIT_BRANCH='fix-searx.sh'
    SEARX_PORT='7777'
    SEARX_BIND_ADDRESS='127.0.0.12'

To test installation procedure, clone feature branch (fix-searx.sh)::

    $ cd ~/Downloads
    $ git clone --branch fix-searx.sh https://github.com/return42/searxng

 searxng
    $ cd searxng

    $ ./utils/searx.sh install all
    ...

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>