Revert "Don't try using XCTAssertNoThrow in Xcode 8.1 or 8.2"

This reverts commit a3cf183.

Thomas provided a better fix for this already.

Author: tbkka

Tests/SwiftProtobufTests/Test_BinaryDelimited.swift

@@ -15,7 +15,7 @@ import SwiftProtobuf
 class Test_BinaryDelimited: XCTestCase {
 
   func testEverything() {
-#if swift(>=3.1)
+#if swift(>=3.1) || os(OSX) || os(iOS)
     // Don't need to test encode/decode since there are plenty of tests specific to that,
     // just test the delimited behaviors.