Link libgtest_main before libgtest

libgtest_main uses symbols from libgtest.  If libgtest_main is linked
after libgtest, and the test .o files don't reference libgtest (which is
unlikely), then the libgtest .o files will be ignored and libgtest_main
won't be able to find its symbols from libgtest.

Change-Id: Ica3bc679bd9d14e9a3065be927f085cf52faab64
diff --git a/core/host_test_internal.mk b/core/host_test_internal.mk
index 06949ed..7f6aff0 100644
--- a/core/host_test_internal.mk
+++ b/core/host_test_internal.mk
@@ -11,4 +11,4 @@
 LOCAL_CFLAGS += -DGTEST_HAS_STD_STRING -O0 -g
 LOCAL_C_INCLUDES +=  external/gtest/include
 
-LOCAL_STATIC_LIBRARIES += libgtest_host libgtest_main_host
+LOCAL_STATIC_LIBRARIES += libgtest_main_host libgtest_host