suppress unnecessary makefile output

checkpolicy spits out a bunch of unnecessary lines during normal
operation, which bloat the logs and hide other more important
warnings. Suppress the normal output.

SELinux compile time errors are printed to stderr, and are
uneffected by this change.

Change-Id: I07f2cbe8afcd14abf1c025355a169b5214ed5c6e

Android.mk

@@ -99,8 +99,8 @@ $(sepolicy_policy.conf): $(call build_policy, $(sepolicy_build_files))
 
 $(LOCAL_BUILT_MODULE): $(sepolicy_policy.conf) $(HOST_OUT_EXECUTABLES)/checkpolicy $(HOST_OUT_EXECUTABLES)/sepolicy-analyze
 	@mkdir -p $(dir $@)
-	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@.tmp $<
-	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $(dir $<)/$(notdir $@).dontaudit $<.dontaudit
+	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@.tmp $< > /dev/null
+	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $(dir $<)/$(notdir $@).dontaudit $<.dontaudit > /dev/null
 	$(hide) $(HOST_OUT_EXECUTABLES)/sepolicy-analyze $@.tmp permissive > $@.permissivedomains
 	$(hide) if [ "$(TARGET_BUILD_VARIANT)" = "user" -a -s $@.permissivedomains ]; then \
 		echo "==========" 1>&2; \
@@ -137,7 +137,7 @@ $(sepolicy_policy_recovery.conf): $(call build_policy, $(sepolicy_build_files))
 
 $(LOCAL_BUILT_MODULE): $(sepolicy_policy_recovery.conf) $(HOST_OUT_EXECUTABLES)/checkpolicy $(HOST_OUT_EXECUTABLES)/sepolicy-analyze
 	@mkdir -p $(dir $@)
-	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@.tmp $<
+	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@.tmp $< > /dev/null
 	$(hide) $(HOST_OUT_EXECUTABLES)/sepolicy-analyze $@.tmp permissive > $@.permissivedomains
 	$(hide) if [ "$(TARGET_BUILD_VARIANT)" = "user" -a -s $@.permissivedomains ]; then \
 		echo "==========" 1>&2; \
@@ -187,7 +187,7 @@ include $(BUILD_SYSTEM)/base_rules.mk
 $(LOCAL_BUILT_MODULE): PRIVATE_BUILT_SEPOLICY.CONF := $(built_general_sepolicy.conf)
 $(LOCAL_BUILT_MODULE): $(built_general_sepolicy.conf) $(HOST_OUT_EXECUTABLES)/checkpolicy
 	@mkdir -p $(dir $@)
-	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@ $(PRIVATE_BUILT_SEPOLICY.CONF)
+	$(hide) $(HOST_OUT_EXECUTABLES)/checkpolicy -M -c $(POLICYVERS) -o $@ $(PRIVATE_BUILT_SEPOLICY.CONF) > /dev/null
 
 built_general_sepolicy := $(LOCAL_BUILT_MODULE)
 ##################################