Disable some tests of less_lexicographical on CLang 3.0
Disable some tests of less_lexicographical on CLang 3.0

Ignore-this: 424a7d3015fae5302f7eccecffd280c
They cause random hangs and crashes, and seem hard to solve.

darcs-hash:20141104145109-c9a90-9a5d1e731155364cc61d46e2501a805c15acba34

rogiervd/range,rogiervd/range,rogiervd/range