Don't define __BRILLO__.

We should be use __ANDROID__, which is automatically defined
by the toolchain, instead.

Bug: 23358460
Change-Id: I0fc1b9b2b38d2b6fbc8b39f545bc2e310bfefa55
diff --git a/libweave/Android.mk b/libweave/Android.mk
index 4538a48..6633bc0 100644
--- a/libweave/Android.mk
+++ b/libweave/Android.mk
@@ -22,7 +22,7 @@
 # ========================================================
 
 libweaveCommonCppExtension := .cc
-libweaveCommonCFlags := -D__BRILLO__ -Wall -Werror \
+libweaveCommonCFlags := -Wall -Werror \
 	-Wno-char-subscripts -Wno-missing-field-initializers \
 	-Wno-unused-function -Wno-unused-parameter