package/{mesa3d, mesa3d-headers}: bump version to 10.6.0

Mesa3d 10.6 adds optional support for SHA-1:
http://cgit.freedesktop.org/mesa/mesa/commit/configure.ac?id=a24bdce46f95cbe9efd3b26f157d1eb36584861f



Adding "--without-sha1" will cause this failure during configure:

configure: error: Illegal value for --with-sha1: no

so I did not add the else-clause when no SHA-1 provider is enabled.

[Thomas: simplify else ifeq.]

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