MT#59962 apps: exclude certain apps from compilation

Just because these have some complication during
the compilation, and these aren't actually used
exclude them for a while to not disturb people
while compiling the whole project:
- conference
- early_announce
- voicemail

Change-Id: Ib8689a0a8077b25ba1d2d433c6b970eded3eb0bd

apps/Makefile

@@ -1,7 +1,7 @@
 COREPATH ?= ../core
 .DEFAULT_GOAL := all
 
-local_exclude_app_modules=confpin early_dbprompt mobile_push py_sems gateway twit
+local_exclude_app_modules=conference confpin early_announce early_dbprompt mobile_push py_sems gateway twit voicemail
 
 include $(COREPATH)/../Makefile.defs