[mtouch] Move native code sharing check for the remove-dynamic-registrar optimization until after checking the linker settings.

[rolfbjarne]

Fixes this test failure:

1. Failed : Xamarin.MTouch.MT0113_linker
   The error 'MT0113: Native code sharing has been disabled for the extension 'testServiceExtension' because the managed linker settings are different between the container app (None) and the extension (All).' was not found in the output:
   Message make install does not work unless make all is already complete #1 did not match:
   actual: 'Native code sharing has been disabled for the extension 'testServiceExtension' because the remove-dynamic-registrar optimization differ between the container app (default) and the extension (false).'
   expected: 'Native code sharing has been disabled for the extension 'testServiceExtension' because the managed linker settings are different between the container app (None) and the extension (All).'

which happens because:

• Removing the dynamic registrar requires the linker, so removal of the dynamic registrar is disabled if the linker is disabled
• This results in the app and appex having different values for the remove-dynamic-registrar option
• Thus the error message.

Technically either error is correct, but I prefer the previous one (about the
linker), because it directly assigns blame (the linker setting). Figuring out
what has to change (the linker setting) when the error message complains about
an optimization is not so straight forward for users.

[spouliot]

Removing the dynamic registrar requires the linker, so removal of the dynamic registrar is disabled if the linker is not disabled should not it be if the linker is disabled ?

[rolfbjarne]

Removing the dynamic registrar requires the linker, so removal of the dynamic registrar is disabled if the linker is not disabled should not it be if the linker is disabled ?

Heh yes, too many negatives in that sentence. Fixed now 😄.

[monojenkins]

Build failure

[rolfbjarne]

Test failures are unrelated:

• watchOS simulators: https://github.com/xamarin/maccore/issues/648