Avoid having to eval `opam env` for the plugin to run

[ManasJayanth]

Remove

vscode-merlin/test/suite/opam.test.js

Lines 25 to 46 in 40b8f8b

	`sh -c 'opam install . --deps-only --yes > /dev/null; opam env'`,
	{ cwd: projectPath }
	)
	.toString();
	let regexpMatch = env.match(/PATH=[^;]+;/g);
	if (regexpMatch.length >= 1) {
	process.env["PATH"] = Array.prototype.reduce.call(
	regexpMatch,
	function(acc, pathString) {
	return (
	acc +
	pathString
	.replace(/[;'"]/g, "")
	.split("=")[1]
	.split(":")
	.concat(process.env["PATH"].split("=")[1])
	.join(":")
	);
	},
	""
	);
	}