CLSA-2026-1777877363 curl: Fix of 2 CVEs

CVE-2019-5436: tftp: use the current blksize for recvfrom - CVE-2016-8615: cookie: replace use of fgets with custom version...

CLSA-2026-1777878036 curl: Fix of 2 CVEs

CVE-2019-5436: tftp: use the current blksize for recvfrom - CVE-2016-8615: cookie: replace use of fgets with custom version...