libsysutils: General clean up + disable build in simulator builds

Signed-off-by: San Mehat <san@google.com>
diff --git a/libsysutils/Android.mk b/libsysutils/Android.mk
index 59461da..2f3e106 100644
--- a/libsysutils/Android.mk
+++ b/libsysutils/Android.mk
@@ -1,3 +1,10 @@
+BUILD_LIBSYSUTILS := false
+ifneq ($(TARGET_SIMULATOR),true)
+    BUILD_LIBSYSUTILS := true
+endif
+
+ifeq ($(BUILD_LIBSYSUTILS),true)
+
 LOCAL_PATH:= $(call my-dir)
 
 include $(CLEAR_VARS)
@@ -23,3 +30,5 @@
 endif
 
 include $(BUILD_SHARED_LIBRARY)
+
+endif