[build] post-build fix of the assembly

[StephaneDelcroix]

Description of Change

[build] post-build fix of the assembly

add the IL corresponding to the old signature of the getter of ResourceLoader.ResourceProvider so code compiled against prior versions do not fail.

@alanmcgovern: could you please

• confirm that the previewer looks for the ResourceProvider using the full signature, and not only the name
• confirm that the old signature was never used, and it's safe not to implement the setter

Bugs Fixed

• fixes ResourceProvider Exception in Xamarin.Forms 3.0 due to Signature Change #2835

API Changes

Behavioral Changes

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of the target branch at time of PR
• Changes adhere to coding standard
• Consolidate commits as makes sense

[alanmcgovern]

Can you remind me where the package shows up? Is it gonna be linked on this PR?

[jassmith]

ShameHat is adorable but no... bad name

[jassmith]

Also do we need all these dlls checked in?

[StephaneDelcroix]

ShameHat is adorable but no... bad name

meh, yes

Also do we need all these dlls checked in?
@jassmith we do not need the dll checked in, we could build the tool as part of our process

[alanmcgovern]

Works for me!

[alanmcgovern]

This works fine for me!