libcurl is added as dependency for gnupg-util to avoid a dependency
error.
The following invalid configuration options are removed:
--disable-ftp
--enable-fake-curl
Fixes: 0a61d56eb3 ("utils/gnupg: add new package gnupg-utils")
Reported-by: Hannu Nyman <hannu.nyman@iki.fi>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>