freerdp: bump to 2.0.0-rc0

freerdp: bump to 2.0.0-rc0

Remove patches that has been merged/updated upstream

0001-fix-building-shared-libs.patch:
CmakeLists packages are rewritten.

0002-add-support-for-tz-package:
https://github.com/FreeRDP/FreeRDP/commit/dd93fd2b3de7bef3f4faebfe04448344a0a5ab88

0003-add-missing-define.patch:
https://github.com/FreeRDP/FreeRDP/commit/656b3be02d22a52957903e3c89660ffb0247307b

0004-ffmpeg30.patch:
https://github.com/FreeRDP/FreeRDP/commit/b7b66968f93f6ce75dd06d12638e14029bf3717b

Also add sha256sum for license file.

Signed-off-by: Adam Duskett <Adamduskett@outlook.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>