Keep applying the windows entropy patch (UWP support).
Remove no longer needed padlock patch.
Update thirdparty README to reflect changes, and new source inclusion
criteria.
(cherry picked from commit e375cbd094)
Remove upstreamed patches.
Re-apply padlock and uwp patches.
NOTE: We could replace our padloack patch with mbedtls 3452.
(cherry picked from commit 36d316876b)
Fixes CVE-2019-18222.
`include/mbedtls/version.h` was modified to include the forgotten
version bump to 2.16.4, fixed upstream by ARMmbed/mbedtls#2992.
