Don't include multinetwork tools in Brillo.

These tools depend on libandroid, which is not present in Brillo.

Bug: 31068444
Change-Id: I0565775ab3effa910149f28bef790b6fed4e6485
Test: `make dist`
diff --git a/multinetwork/Android.mk b/multinetwork/Android.mk
index 28e56d4..16ca6c5 100644
--- a/multinetwork/Android.mk
+++ b/multinetwork/Android.mk
@@ -10,7 +10,9 @@
 LOCAL_C_INCLUDES += frameworks/native/include external/libcxx/include
 LOCAL_CPPFLAGS += -std=c++11
 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
-LOCAL_MODULE_TAGS := debug
+ifndef BRILLO
+    LOCAL_MODULE_TAGS := debug
+endif  #!BRILLO
 LOCAL_SHARED_LIBRARIES := libandroid libbase libc++
 LOCAL_SRC_FILES := dnschk.cpp common.cpp
 include $(BUILD_EXECUTABLE)
@@ -21,7 +23,9 @@
 LOCAL_C_INCLUDES += frameworks/native/include external/libcxx/include
 LOCAL_CPPFLAGS += -std=c++11
 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
-LOCAL_MODULE_TAGS := debug
+ifndef BRILLO
+    LOCAL_MODULE_TAGS := debug
+endif  #!BRILLO
 LOCAL_SHARED_LIBRARIES := libandroid libbase libc++
 LOCAL_SRC_FILES := httpurl.cpp common.cpp
 include $(BUILD_EXECUTABLE)