libcurl: security bump to version 7.74.0

Fixes security issues:

CVE-2020-8286: Inferior OCSP verification

CVE-2020-8285: FTP wildcard stack overflow

CVE-2020-8284: trusting FTP PASV responses

Drop upstream patch.

Cc: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>