recipetool: extend curl detection when creating recipes

If a configure.ac uses LIBCURL_CHECK_CONFIG it wants curl.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 16e830ca)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>