Define SIZEOF_OFF_T in Android.mk.

Change-Id: Ie991972c939565e28f6ad1c9f86531bc014faf66
diff --git a/Android.mk b/Android.mk
index f3b2432..539bc04 100644
--- a/Android.mk
+++ b/Android.mk
@@ -123,6 +123,7 @@
     -DMAJOR_IN_SYSMACROS \
     -DPACKAGE_NAME='"strace"' \
     -DVERSION='"$(strace_version)"' \
+    -DSIZEOF_OFF_T=SIZEOF_LONG \
     -DSIZEOF_LONG_LONG=8 \
     -DSTDC_HEADERS=1 \
     -DSTRACE_KNOWS_ONLY_EABI=1 \