package/mesa3d: depends on BR2_TOOLCHAIN_HAS_SYNC_1

package/mesa3d: depends on BR2_TOOLCHAIN_HAS_SYNC_1

Fixes
http://autobuild.buildroot.net/results/399/399d76ac70c3933604067e2c6dcb4086b50acfff/
http://autobuild.buildroot.net/results/70c/70cd299600985d7cf00c5b449f7e75284160551a/
http://autobuild.buildroot.net/results/b4a/b4ab89c3628dd648683e25f9e3c6238f13871aba/
http://autobuild.buildroot.net/results/33d/33d6dc8e1f57b5a02b07c50e5cefa272c6d992fc/
http://autobuild.buildroot.net/results/7f3/7f32a9577ee2e50af38d4f60de50d938792b66a3/
http://autobuild.buildroot.net/results/c98/c98b74d1d1342ca18fb161d010e94d45462ac6f1/
and others

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