try to avoid build breakage with cppunit on android

Broken by eef53622 , and I've had enough
of tinderbox mails during the last week.

Change-Id: Iab0fe0363e8ca3212eb673ae1da9492140140bc3

sc/Module_sc.mk

@@ -16,10 +16,15 @@ $(eval $(call gb_Module_add_targets,sc,\
 	Library_scd \
 	Library_scfilt \
 	Library_scui \
-	Library_scqahelper \
 	UIConfig_scalc \
 ))
 
+ifneq (,$(filter DESKTOP,$(BUILD_TYPE)))
+$(eval $(call gb_Module_add_targets,sc,\
+	Library_scqahelper \
+))
+endif
+
 ifeq ($(ENABLE_TELEPATHY),TRUE)
 
 $(eval $(call gb_Module_add_targets,sc,\