Move file I/O out of ELFF, abstracting them in platform-independent fasion.

Change-Id: Ie8800dc96db810e352618bfea8243ab008ae9d2c
diff --git a/Makefile.android b/Makefile.android
index 1929cb3..0b719e0 100644
--- a/Makefile.android
+++ b/Makefile.android
@@ -604,6 +604,7 @@
               android/utils/system.c \
               android/utils/tempfile.c \
               android/utils/timezone.c \
+              android/utils/mapfile.c \
               android/avd/hw-config.c \
               android/avd/info.c \