[dotnet] Treat the ICU data file as a resource instead of an assembly.

We can fix this better once this fix reaches us:

    dotnet/runtime#87813

because then we can set the ICU data file at build time (to a relative path).

dotnet/targets/Xamarin.Shared.Sdk.targets

@@ -153,6 +153,11 @@
 	<!-- Default item includes (globs and implicit references) -->
 	<Import Project="Xamarin.Shared.Sdk.DefaultItems.targets" />
 
+	<PropertyGroup Condition="'$(_GlobalizationDataFileLocation)' == ''">
+		<_GlobalizationDataFileLocation Condition="'$(_UseNativeAot)' == 'true'">Resource</_GlobalizationDataFileLocation>
+		<_GlobalizationDataFileLocation Condition="'$(_UseNativeAot)' != 'true'">Assembly</_GlobalizationDataFileLocation>
+	</PropertyGroup>
+
 	<!-- dotnet publish -->
 	<Import Project="Xamarin.Shared.Sdk.Publish.targets" />
 
@@ -1650,7 +1655,7 @@
 				            '%(ResolvedFileToPublish.Filename)%(ResolvedFileToPublish.Extension)' == '$(_GlobalizationDataFile)' And
 				            '%(ResolvedFileToPublish.NuGetPackageId)' == '$(_MonoNugetPackageId)'
 				            "
-				PublishFolderType="Assembly"
+				PublishFolderType="$(_GlobalizationDataFileLocation)"
 			/>
 
 			<!-- Remove the libxamarin-*.dylib files we don't want -->

runtime/runtime.m

@@ -2589,12 +2589,14 @@ -(void) xamarinSetFlags: (enum XamarinGCHandleFlags) flags;
 	int subtractPropertyCount = 0;
 
 	if (xamarin_icu_dat_file_name != NULL && *xamarin_icu_dat_file_name != 0) {
+#if !defined (NATIVEAOT)
 		char path [1024];
 		if (!xamarin_locate_app_resource (xamarin_icu_dat_file_name, path, sizeof (path))) {
 			LOG (PRODUCT ": Could not locate the ICU data file '%s' in the app bundle.\n", xamarin_icu_dat_file_name);
 		} else {
 			icu_dat_file_path = strdup (path);
 		}
+#endif // !defined (NATIVEAOT)
 	} else {
 		subtractPropertyCount++;
 	}