Fix sim-eng build after upgrade to ICU 4.4.

(The master sim-eng build is broken atm, but the dalvik-dev sim-eng build
caught this.)

Change-Id: I4a4b43f92f3916b3c2d9f7d501e0fbe88c001bd6
diff --git a/i18n/digitlst.cpp b/i18n/digitlst.cpp
index b47353f..eabf5af 100644
--- a/i18n/digitlst.cpp
+++ b/i18n/digitlst.cpp
@@ -36,7 +36,7 @@
 #include <limits.h>
 #include <string.h>
 #include <stdio.h>
-#ifdef HAVE_ANDROID_OS
+#ifdef ANDROID
 #include <math.h>
 #else
 #include <limits>