Make inheriting environment variables optional

[Kamik423]

Currently, the shell environment is queried for the environment variables to be passed onto the process.

NativeJavaApplicationStub/NativeJavaApplicationStub/Util/Shell.swift

Lines 25 to 65 in 436bf69

	/// Environment variables captured from a login shell.
	///
	/// The login-shell environment is useful for inheriting user profile setup
	/// (for example PATH modifications from shell startup files).
	/// Returns `nil` when the shell cannot be launched or returns no entries.
	public let defaultShellEnvironment: [String: String]? = {
	let task = Process()
	task.executableURL = URL(fileURLWithPath: SHELL)
	task.arguments = ["-l", "-c", "env -0"]
	let stdoutPipe = Pipe()
	task.standardOutput = stdoutPipe
	task.standardError = FileHandle.nullDevice
	let output: Data
	do {
	try task.run()
	// Drain stdout while the process is alive to avoid pipe backpressure deadlocks.
	output = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
	task.waitUntilExit()
	} catch {
	return nil
	}
	guard task.terminationStatus == 0 else {
	return nil
	}
	var environment: [String: String] = [:]
	for rawEntry in output.split(separator: 0) {
	let entry = String(decoding: rawEntry, as: UTF8.self)
	guard let separator = entry.firstIndex(of: "=") else {
	continue
	}
	let key = String(entry[..<separator])
	let value = String(entry[entry.index(after: separator)...])
	environment[key] = value
	}
	return environment.isEmpty ? nil : environment
	}()

Normal Mac apps do not inherit the environment variables from the default shell. Java applications should not be treated differently as a whole. Loading the environment variables should still be possible, but it should require setting a key in the Info.plist.

Any Java application can get the environment variables still by calling the default shell with any configuration. Just not with System.getenv().