Fix LOCAL_MODULE_HOST_OS

Make sure LOCAL_IS_HOST_MODULE is set before including
module_arch_supported.mk

Bug: 23566667
Change-Id: I28ef10f093407eb3a6a83574ecc3f098eb775241
diff --git a/core/host_executable.mk b/core/host_executable.mk
index 0091f3f..5601b01 100644
--- a/core/host_executable.mk
+++ b/core/host_executable.mk
@@ -1,4 +1,4 @@
-
+LOCAL_IS_HOST_MODULE := true
 my_prefix := HOST_
 include $(BUILD_SYSTEM)/multilib.mk