package/mesa3d: bump version to 19.2.0

package/mesa3d: bump version to 19.2.0

Updated license hash after cosmetical upstream commits:
https://cgit.freedesktop.org/mesa/mesa/log/docs/license.html?h=19.2

Upstream removed asm configure option:
https://cgit.freedesktop.org/mesa/mesa/commit/meson.build?h=19.2&id=20294dceebc23236e33b22578245f7e6f41b6997

Removed dependency to DRI swrast driver for
BR2_PACKAGE_MESA3D_OSMESA_CLASSIC after upstream commit
https://cgit.freedesktop.org/mesa/mesa/commit/meson.build?h=19.2&id=b816edcbf40abca1e3d68b1a706f5670b3fcf4d7
removed this dependency.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>