Build: use dune instead of oasis

src/META

-# OASIS_START
-# DO NOT EDIT (digest: 64ccb3e4daf703dc6f470425eb24347c)
-version = "1.49.5"
-description = "shared by Verimag/synchronous tools (lustre, lutin, rdbg)."
-requires = "unix str num"
-archive(byte) = "lutils.cma"
-archive(byte, plugin) = "lutils.cma"
-archive(native) = "lutils.cmxa"
-archive(native, plugin) = "lutils.cmxs"
-exists_if = "lutils.cma"
-# OASIS_STOP
-

src/lutils.mldylib

-# OASIS_START
-# DO NOT EDIT (digest: e5caefa2b739fcc2fe051e5e6488ee4e)
-RifIO
-Data
-LocalGenlex
-GnuplotRif
-Mypervasives
-Luciole
-LutilsVersion
-# OASIS_STOP

src/lutils.mllib

-# OASIS_START
-# DO NOT EDIT (digest: e5caefa2b739fcc2fe051e5e6488ee4e)
-RifIO
-Data
-LocalGenlex
-GnuplotRif
-Mypervasives
-Luciole
-LutilsVersion
-# OASIS_STOP