debuggerd: use __android_log_is_debuggable()

Test: compile and signal 8 to some component
Bug: 27566046
Bug: 31456426
Change-Id: I35e83679fbc40d54217850521bff23d9306d86f8
diff --git a/debuggerd/Android.mk b/debuggerd/Android.mk
index 1fc850f..155b309 100644
--- a/debuggerd/Android.mk
+++ b/debuggerd/Android.mk
@@ -120,6 +120,7 @@
     libbacktrace \
     libbase \
     libcutils \
+    liblog
 
 debuggerd_c_includes := \
     $(LOCAL_PATH)/test \