package/mesa3d: needs dynamic library

package/mesa3d: needs dynamic library

Fixes
http://autobuild.buildroot.net/results/5ee/5eef099e82e7a65d9b459d88fcb82b468ccf8fed/
http://autobuild.buildroot.net/results/e5c/e5c0e693505798ec366328ed87de3460cd07894d/
http://autobuild.buildroot.net/results/c6b/c6b6a21f73fc84f4784dd00de504ef0eea3bdaf1/
http://autobuild.buildroot.net/results/abd/abd3e2850ee457fc456de3f1641b92405d995e16/
http://autobuild.buildroot.net/results/2c4/2c40fe209e6006fdf148e547b1fafe9180afc85d/

[Thomas: remove propagation of the dynamic library dependency to
glmark2 and mesa3d-demos, since none of them select mesa3d.]

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