[msbuild] Remove some logic for watchOS on .NET. (#18473)

We don't support watchOS on .NET, so this is just useless code.

msbuild/Makefile

@@ -439,14 +439,6 @@ DOTNET_TARGETS += \
 
 endif
 
-# watchOS: contains all of the files for iOS as well (for now, we don't need all of them, so this is optimizable)
-ifdef INCLUDE_WATCH
-DOTNET_TARGETS += \
-	$(foreach target,$(DOTNET_SHARED_FILES)       ,$(DOTNET_DESTDIR)/$(WATCHOS_NUGET).Sdk/tools/msbuild/iOS/$(notdir $(target)))           \
-	$(foreach target,$(DOTNET_WATCHOS_FILES)      ,$(DOTNET_DESTDIR)/$(WATCHOS_NUGET).Sdk/tools/msbuild/watchOS/$(notdir $(target)))       \
-
-endif
-
 # macOS
 ifdef INCLUDE_MAC
 DOTNET_TARGETS += \
@@ -467,8 +459,6 @@ DOTNET_DIRECTORIES += \
 	$(DOTNET_DESTDIR)/$(IOS_WINDOWS_NUGET).Sdk/tools/msbuild/iOS \
 	$(DOTNET_DESTDIR)/$(TVOS_NUGET).Sdk/tools/msbuild/iOS \
 	$(DOTNET_DESTDIR)/$(TVOS_NUGET).Sdk/tools/msbuild/tvOS \
-	$(DOTNET_DESTDIR)/$(WATCHOS_NUGET).Sdk/tools/msbuild/iOS \
-	$(DOTNET_DESTDIR)/$(WATCHOS_NUGET).Sdk/tools/msbuild/watchOS \
 	$(DOTNET_DESTDIR)/$(MACOS_NUGET).Sdk/tools/msbuild/macOS \
 	$(DOTNET_DESTDIR)/$(MACCATALYST_NUGET).Sdk/tools/msbuild/iOS \
 	$(DOTNET_DESTDIR)/$(MACCATALYST_NUGET).Sdk/tools/msbuild/MacCatalyst \
@@ -485,12 +475,6 @@ $(DOTNET_DESTDIR)/$(TVOS_NUGET).Sdk/tools/msbuild/%: $(IOS_DESTDIR)$(MONOTOUCH_P
 $(DOTNET_DESTDIR)/$(TVOS_NUGET).Sdk/tools/msbuild/tvOS/%: $(IOS_DESTDIR)$(MONOTOUCH_PREFIX)/lib/msbuild/TVOS/% | $(DOTNET_DIRECTORIES)
 	$(Q) $(CP) $< $@
 
-$(DOTNET_DESTDIR)/$(WATCHOS_NUGET).Sdk/tools/msbuild/%: $(IOS_DESTDIR)$(MONOTOUCH_PREFIX)/lib/msbuild/% | $(DOTNET_DIRECTORIES)
-	$(Q) $(CP) $< $@
-
-$(DOTNET_DESTDIR)/$(WATCHOS_NUGET).Sdk/tools/msbuild/watchOS/%: $(IOS_DESTDIR)$(MONOTOUCH_PREFIX)/lib/msbuild/WatchOS/% | $(DOTNET_DIRECTORIES)
-	$(Q) $(CP) $< $@
-
 $(DOTNET_DESTDIR)/$(MACCATALYST_NUGET).Sdk/tools/msbuild/%: $(IOS_DESTDIR)$(MONOTOUCH_PREFIX)/lib/msbuild/% | $(DOTNET_DIRECTORIES)
 	$(Q) $(CP) $< $@