Add functions to provide target sdk version

Bug: http://b/21364029
Change-Id: I8648d1bff6c8fd6e7cd12da7f128e048b9f2829a
diff --git a/libdl/Android.mk b/libdl/Android.mk
index 2a0724a..7b97dc4 100644
--- a/libdl/Android.mk
+++ b/libdl/Android.mk
@@ -15,7 +15,7 @@
 #
 # DO NOT REMOVE --exclude-libs!
 
-LOCAL_LDFLAGS := -Wl,--exclude-libs=libgcc.a
+LOCAL_LDFLAGS := -Wl,--exclude-libs=libgcc.a -Wl,--version-script=$(LOCAL_PATH)/libdl.map
 
 # for x86, exclude libgcc_eh.a for the same reasons as above
 LOCAL_LDFLAGS_x86 := -Wl,--exclude-libs=libgcc_eh.a