package/libcurl: Remove autoreconf

When libcurl-0001-build-link-curl-to-NSS-libraries-when-NSS-support.patch
was removed the corresponding autoreconf was left behind:
http://git.buildroot.net/buildroot/commit/?id=9185b64ed5599622cb89ca4ee6ee29440b02ec8a



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>