[gentoo-dev] dune.eclass change to build release

[Alfredo Tupone]

This is for review the change i ndune.eclass

The reason is that the new ocaml-4.12 compiler raise some
warning that dune transform in fatal error
The following changes is to build with profile release.
That will change compiler warning to not raise fatal error during build

diff --git a/eclass/dune.eclass b/eclass/dune.eclass
index 5e2c1fa1f7c4..02a8a870ef43 100644
--- a/eclass/dune.eclass
+++ b/eclass/dune.eclass
@@ -30,31 +30,31 @@ QA_FLAGS_IGNORED='.*'
 
 EXPORT_FUNCTIONS src_compile src_test src_install
 
 RDEPEND=">=dev-lang/ocaml-4:=[ocamlopt?] dev-ml/dune:="
 case ${EAPI:-0} in
        5|6)
                DEPEND="${RDEPEND} dev-ml/dune"
                ;;
        *)
                BDEPEND="dev-ml/dune dev-lang/ocaml"
                DEPEND="${RDEPEND}"
                ;;
 esac
 
 dune_src_compile() {
-       dune build @install || die
+       dune build @install --profile release || die
 }
 
 dune_src_test() {
        dune runtest || die
 }
 
 # @FUNCTION: dune-install
 # @USAGE: <list of packages>
 # @DESCRIPTION:
 # Installs the dune packages given as arguments. For each "${pkg}"
 element in # that list, "${pkg}.install" must be readable from
 "${PWD}/_build/default" dune-install() {
        local pkg
        for pkg ; do
                dune install \