Rename the binary files of curl-impersonate so that the Firefox and
Chrome versions can co-exist on the same system. The Firefox version is
now named 'curl-impersonate-ff' and 'libcurl-impersonate-ff' and the
Chrome version is named 'curl-impersonate-chrome' and
'libcurl-impersonate-chrome'. The wrapper scripts look for these names
as well. Symbolic names with the old names are still created inside the
Docker images to keep compatibility as much as possible.