Building HueEmulator library fails

Because of missing `lxml` python requirement.
This is defined in UPnP-Schemas but `make fetch` doesn't recurse dependencies.

However, running `make submodules` from the project directory does fix the problem.
Should have gone with that to start with!

Tools/ci/library/Makefile

@@ -36,6 +36,7 @@ apps: $(APP_NAMES)
 .PHONY: $(APP_NAMES)
 $(APP_NAMES):
 	@printf "\n\n** Building $@ for $(SMING_SOC) **\n\n"
+	$(Q) $(MAKE) --no-print-directory -C $@ submodules
 	$(Q) $(MAKE) --no-print-directory -C $@ PIP_ARGS=-q python-requirements sample
 
 .PHONY: run-test

Tools/ci/library/appveyor.txt

@@ -37,10 +37,6 @@ install:
         . sming/Tools/ci/install.sh ${SMING_ARCH,,}
       fi
 
-  - ps: |
-      Start-Process -FilePath make -ArgumentList "-C $env:SMING_HOME fetch-$env:APPVEYOR_PROJECT_SLUG" -Wait -NoNewWindow
-
-
 build_script:
   - sh: make -j$(nproc) -f $CI_MAKEFILE
   - cmd: make -j%NUMBER_OF_PROCESSORS% -f %CI_MAKEFILE%