Make sure to clean SEMLA

Belonging to [master]:
  - #2503

Makefile.common

@@ -43,6 +43,7 @@ semla: mkbuilddirs
 semla-clean:
 	rm -rf ../SEMLA/build
 	rm -rf ../SEMLA/install
+	rm -rf $(builddir_lib)/omc/SEMLA
 endif # end of OMENCRYPTION
 
 mkbuilddirs:
@@ -350,7 +351,11 @@ openblas-clean:
 	# OpenBLAS make clean actually gives error-messages. Let it do it, but silently
 	test ! -d 3rdParty/OpenBLAS-0.2.8 || $(MAKE) -C 3rdParty/OpenBLAS-0.2.8 clean > /dev/null 2>&1
 
+ifeq ($(OMENCRYPTION),yes)
+clean: semla-clean fmil-clean opencl_rt_clean gc-clean lis-clean runtimeCPPclean CMinpack-clean metis-clean Cdaskr-clean bootstrap-clean msgpack-clean graphstream-clean openblas-clean umfpack-clean
+else
 clean: fmil-clean opencl_rt_clean gc-clean lis-clean runtimeCPPclean CMinpack-clean metis-clean Cdaskr-clean bootstrap-clean msgpack-clean graphstream-clean openblas-clean umfpack-clean
+endif
 	(cd SimulationRuntime/c && $(MAKE) -f $(defaultMakefileTarget) clean OMBUILDDIR=$(OMBUILDDIR))
 	(cd Compiler && $(MAKE) -f $(defaultMakefileTarget) clean OMBUILDDIR=$(OMBUILDDIR))
 	(cd Parser && $(MAKE) -f $(defaultMakefileTarget) clean OMBUILDDIR=$(OMBUILDDIR))