More generic version of r42885: guarantee thread stack size to be >= 2MB on all platforms.
More generic version of r42885: guarantee thread stack size to be >= 2MB on all platforms.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@42887 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT