Import FoundationNetworking on Linux to fix tests.

[kbongort]

FoundationNetworking is required for NSURLSession and such.

[swifter-bot]

	2 Warnings
⚠️	It seems like you’ve added new tests to the library. If that’s the case, please update the XCTestManifests.swift file running in your terminal the command swift test --generate-linuxmain.
⚠️	If you ran the command swift test --generate-linuxmain in your terminal, please remove the line testCase(IOSafetyTests.__allTests__IOSafetyTests), from public func __allTests() -> [XCTestCaseEntry] in the bottom of the file. For more reference see #366.

	1 Message
📖	Hey, @kbongort 👋.

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[Vkt0r]

Hey, @kbongort Thanks for taking the time to fix this! I already integrated your changes in a draft PR #448 I've to fix the Linux infrastructure issue with CircleCI. Please rebase and update this PR in order to merge it.

[kbongort]

@Vkt0r do you need me to update this PR or should I just close it since you've incorporated the same changes into #448?

[Vkt0r]

@kbongort Please update it to merge it. I integrated your changes to test my branch, I'll rebase it once yours is in the stable branch.

[kbongort]

@Vkt0r Ok, I've updated this PR.