Remove workaround for ResolveReadyToRunCompilers failing

[rolfbjarne]

Remove workaround for this issue once the fix has reached us: dotnet/runtime#122985

See:

macios/dotnet/targets/Microsoft.Sdk.R2R.targets

Lines 12 to 37 in ec8317c

	<!-- TODO: Remove ResolveReadyToRunCompilers target -->
	<!-- This shouldn't be necessary once we get https://github.com/dotnet/dotnet/pull/3754 -->
	<Target Name="ResolveReadyToRunCompilers" Condition="'$(PublishReadyToRun)' == 'true' And '$(UseMonoRuntime)' != 'true'">
	<PropertyGroup>
	<_Crossgen2Path Condition="'$(Crossgen2Path)' != ''">$(Crossgen2Path)</_Crossgen2Path>
	<_FlattenedCrossgen2Packs>@(ResolvedCrossgen2Pack->'%(PackageDirectory)')</_FlattenedCrossgen2Packs>
	<_Crossgen2Path Condition="'$(Crossgen2Path)' == ''">$(_FlattenedCrossgen2Packs)/tools/crossgen2</_Crossgen2Path>
	<_TargetArch>$(RuntimeIdentifier.Split('-')[1])</_TargetArch>
	<_TargetOS>$(RuntimeIdentifier.Split('-')[0])</_TargetOS>
	</PropertyGroup>
	<ItemGroup>
	<Crossgen2Tool Include="$(_Crossgen2Path)"
	TargetArch="$(_TargetArch)"
	TargetOS="$(_TargetOS)"
	PerfmapFormatVersion="$(PublishReadyToRunPerfmapFormatVersion)"/>
	</ItemGroup>
	<Message Text="Using crossgen2: $(_Crossgen2Path)" Importance="high" />
	<Message Text=" RuntimeIdentifier: $(RuntimeIdentifier)" Importance="high" />
	<Message Text=" TargetArch: $(_TargetArch)" Importance="high" />
	<Message Text=" TargetOS: $(_TargetOS)" Importance="high" />
	<Error Condition="!Exists('$(_Crossgen2Path)')" Text="The crossgen2 executable '$(_Crossgen2Path)' does not exist." />
	</Target>

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