Update BinaryCompatBaseline.txt

Update Binary Compatibility Check to reflect the changes in Xamarin.Mac due to the import of HttpClient implementation from CoreFX dotnet/macios@5d4ada3#diff-450d8ab830620cd9e57f8be5c8f2c625L361-R361

Author: dalexsoto

main/build/MacOSX/BinaryCompatBaseline.txt

@@ -148,6 +148,8 @@ In assembly 'Xamarin.AndroidDesigner.Mac, Version=0.0.0.0, Culture=neutral, Publ
 In assembly 'Xamarin.AzureSupport, Version=1.0.0.0, Culture=neutral, PublicKeyToken=3ead7498f347467b': unable to resolve reference to 'Microsoft.Developer.IdentityService.Client, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
 In assembly 'Xamarin.AzureSupport, Version=1.0.0.0, Culture=neutral, PublicKeyToken=3ead7498f347467b': unable to resolve reference to 'Xamarin.Ide.Identity, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'
 In assembly 'Xamarin.iOSDesigner.MonoDevelop, Version=0.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756': unable to resolve reference to 'MonoTouch.Hosting, Version=0.0.0.0, Culture=neutral, PublicKeyToken=5caa9e03e69a5abd'
-In assembly 'Xamarin.Mac, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065': Unable to resolve member reference 'System.Net.Http.Headers.HttpHeaderKind System.Net.Http.Headers.HttpHeaders::GetKnownHeaderKind(System.String)' from assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
-In assembly 'Xamarin.Mac, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065': Unable to resolve type reference 'System.Net.Http.Headers.HttpHeaderKind' in 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
+In assembly 'Xamarin.Mac, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065': Unable to resolve member reference 'System.Boolean System.Net.Http.Headers.HeaderDescriptor::TryGet(System.String,System.Net.Http.Headers.HeaderDescriptor&)' from assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
+In assembly 'Xamarin.Mac, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065': Unable to resolve member reference 'System.Net.Http.Headers.HttpHeaderType System.Net.Http.Headers.HeaderDescriptor::get_HeaderType()' from assembly 'System.Net.Http, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
+In assembly 'Xamarin.Mac, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065': Unable to resolve type reference 'System.Net.Http.Headers.HeaderDescriptor' in 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
+In assembly 'Xamarin.Mac, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065': Unable to resolve type reference 'System.Net.Http.Headers.HttpHeaderType' in 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
 In assembly 'XamarinStudio.MSDeploy, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null': unable to resolve reference to 'Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'