curl: upgraded package to upstream

Upgraded net-misc/curl to version 7.74.0-r2 on amd64

Also, add the license curl file.

BUG=b/175768987,b/175769011,b/175769053,b/175769177,b/175769120
TEST=presubmit
RELEASE_NOTE=Fixed CVE-2020-8177, CVE-2020-8169, CVE-2020-8285,
CVE-2020-8284 and CVE-2020-8286.

cos-patch: lts-refresh
Change-Id: If1ab52abefa8b00aa0d368c163882c837c8c696a
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/12831
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
6 files changed