starter: Remove START_CHARON compile flag

Since the removal of pluto this is quite superfluous. The flag itself
might be useful to avoid starting charon if the executable does not
exist for some reason (e.g. if DAEMON_NAME is incorrect).

src/starter/Android.mk

@@ -19,7 +19,7 @@ LOCAL_C_INCLUDES += \
 	$(strongswan_PATH)/src/starter \
 	$(strongswan_PATH)/src/stroke
 
-LOCAL_CFLAGS := $(strongswan_CFLAGS) -DSTART_CHARON \
+LOCAL_CFLAGS := $(strongswan_CFLAGS) \
 	-DIPSEC_SCRIPT='"ipsec"' \
 	-DPLUGINS='"$(strongswan_STARTER_PLUGINS)"'