package/mesa3d: bump version to 21.1.0

Removed kmsro-related options, these are now handled by the build
system:
https://cgit.freedesktop.org/mesa/mesa/commit/?id=70813c1c13b99cb029c8fa3537163650bdd17b6d

Updated license hash due to typo fix in upstream commit:
https://cgit.freedesktop.org/mesa/mesa/commit/?id=2f42c21221cf89f738225e3ac2aa2e85953c1dc1

Rebased patch 0003 due to upstream commit:
https://cgit.freedesktop.org/mesa/mesa/commit/?id=a9618e7c4214e29c97009870ad8904623746ffe9



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>