package/freerdp: security bump to version 2.0.0

package/freerdp: security bump to version 2.0.0

>From the ChangeLog:
- Fix multiple CVEs: CVE-2020-11521 CVE-2020-11522 CVE-2020-11523
  CVE-2020-11524 CVE-2020-11525 CVE-2020-11526
- Fix multiple other security related issues (#6005, #6006, #6007,
  #6008, #6009, #6010, #6011, #6012, #6013)

- Retrieve official tarball
- Drop patch (already in version)
- libusb is needed for urbdrc channel since
  https://github.com/FreeRDP/FreeRDP/commit/0927d7aa50c76b671b55c33e0f06c950d1f08e9a
- Add a patch to fix build on uclibc
- Update indentation in hash file (two spaces)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>