Update opam

Author: anmonteiro

packages/melange/melange.1.0.0/opam

@@ -19,6 +19,7 @@ depends: [
   "reactjs-jsx-ppx" {with-test}
   "odoc" {with-doc}
 ]
+available: arch != "x86_32" & arch != "arm32"
 build: [
   ["dune" "subst"] {dev}
   [
@@ -29,7 +30,6 @@ build: [
     "-j"
     jobs
     "@install"
-    "@runtest" {with-test}
     "@doc" {with-doc}
   ]
 ]