Do not force turn off of Jack warning

When ANDROID_JACK_EXTRA_ARGS is defined there is no reason to still turn
off those warnings.

Change-Id: Ic7ac02c72ed3b7b0eaca9394c9fc7d92d5dfa871

core/config.mk

@@ -571,8 +571,6 @@ else
 JACK_DEFAULT_ARGS := $(BUILD_SYSTEM)/jack-default.args
 DEFAULT_JACK_EXTRA_ARGS := @$(JACK_DEFAULT_ARGS)
 endif
-# Turn off jack warnings by default.
-DEFAULT_JACK_EXTRA_ARGS += --verbose error
 
 PROGUARD := external/proguard/bin/proguard.sh
 JAVATAGS := build/tools/java-event-log-tags.py

core/jack-default.args

@@ -2,4 +2,5 @@
 -D sched.runner.thread.kind=fixed
 -D sched.runner.thread.fixed.count=4
 --sanity-checks off
--D jack.reporter.level.file=error=--,warning=-
+-D jack.reporter.level.file=error=--,warning=-
+--verbose error