* Enable default constructor on NEPacketTunnelProvider
* NEPacketTunnelNetworkSettings needs the same constructor as parent class
* skip NEPacketTunnelProvider in ctor init test
From @VincentDondain
`NEPacketTunnelProvider *a = [[NEPacketTunnelProvider alloc] init];` return `nil` without these entitlements:
```
<key>com.apple.developer.networking.networkextension</key>
<array>
<string>packet-tunnel-provider</string>
<string>app-proxy-provider</string>
<string>content-filter-provider</string>
</array>
```
Note: you're also supposed to call it from its "extension process" otherwise you get: `NEProvider objects cannot be instantiated from non-extension processes.`
Hence from an iOS App Extension that has the `com.apple.networkextension.packet-tunnel` extension point.
Fix a false positive when a .ctor is exposed with paramaters using a
subclass of what the designated initializer is exposing.
reference:
[FAIL] UIKit.UIGraphicsPdfRenderer should re-expose UIGraphicsRenderer::.ctor(CGRect, UIGraphicsRendererFormat)
Those tests needs to be run with the linker disabled since they use
reflection for most of their work.
The original dontlink (for linker tests) was becoming too large in
some configuration (e.g. tvOS release with bitcode) but this was
due to other BCL assemblies (not the introspection tests)
Timothy Risi
batmaninpink
Sebastien Pouliot
Vincent Dondain
Rolf Bjarne Kvinge
Sebastien Pouliot