In the wrapper scripts, both OCAMLPATH and CAML_LD_LIBRARY_PATH where
being created with a trailing literal $OCAMLPATH, rather than the
expanded version. Thus if, for example, ocamlPackages.core was present
in OCAMLPATH prior to running utop, the wrapper script would set the
variable to $utop_dependencies:'$OCAMLPATH', and when using utop to
open Core.Std, the following error was reported:
findlib: [WARNING] cannot read directory $OCAMLPATH: No such file
or directory
This patch fixes the quoting issue, and further refactors the build to
use standard wrapProgram helper, and uses an "inner derivation" to
re-use the setupHook machinery of buildOCaml and findlib instead of
manually specifying the OCAMLPATH required for utop along with
transitive dependencies.
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