curl: Fix CVE-2020-8284, CVE-2020-8285, CVE-2020-8286

Backport the CVE patches from upstream
https://github.com/curl/curl/commit/ec9cc725d598ac
https://github.com/curl/curl/commit/a95a6ce6b809693a1195e3b4347a6cfa0fbc2ee7
https://github.com/curl/curl/commit/69a358f2186e04
https://github.com/curl/curl/commit/d9d01672785b.patch



0002-remove-void-protop-create-union-p.patch is added because the CVE-2020-8285 fix is
dependent on it.

CVE:
CVE-2020-8284
CVE-2020-8285
CVE-2020-8286

Signed-off-by: Khairul Rohaizzat Jamaluddin <khairul.rohaizzat.jamaluddin@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>