Enable ZT_TRACE and more verbose build output

java/build.xml

@@ -37,6 +37,7 @@
     <target name="build_android">
         <exec dir="jni" executable="${env.NDK_BUILD_LOC}" failonerror="true">
             <arg value="ZT1=${user.dir}/../"/>
+            <arg value="V=1"/>
         </exec>
         <copy file="libs/armeabi/libZeroTierOneJNI.so" 
               tofile="${user.dir}/classes/lib/armeabi/libZeroTierOneJNI.so" 

java/jni/Application.mk

@@ -1,3 +1,4 @@
 APP_ABI := armeabi armeabi-v7a arm64-v8a x86
 APP_STL := gnustl_static
-APP_CPPFLAGS += -Wall -fPIE -fstack-protector -fexceptions
+APP_CPPFLAGS += -Wall -fPIE -fstack-protector -fexceptions -DZT_TRACE
+