dev-ocaml/findlib: Force compiling with -j1

Change-Id: Icac2d8a69e545e87c0eb2343e39b87dda3201a9a
Adding oasis.exlib

Change-Id: I6fb3343d97d427244667794e0d0c0bf3af53ea6a
dev-ocaml/cmdliner: Initial exheres (v0.9.3)

Change-Id: I717325fcbd9748d455e78c4ac7839924ed1e959b