Remove AndroidMkExtraFootersFunc entries param.

I added in case anyone needs to access AndroidMkEntries to generate
footer lines, but nobody uses it, and it only confuses people.

Test: m nothing, TreeHugger
Change-Id: Ic8a450e3c306d9228c1fdec212c7441bd6aaee03
diff --git a/sdk/sdk.go b/sdk/sdk.go
index 50b0886..f3d0750 100644
--- a/sdk/sdk.go
+++ b/sdk/sdk.go
@@ -311,7 +311,7 @@
 		DistFiles:  android.MakeDefaultDistFiles(s.snapshotFile.Path()),
 		Include:    "$(BUILD_PHONY_PACKAGE)",
 		ExtraFooters: []android.AndroidMkExtraFootersFunc{
-			func(w io.Writer, name, prefix, moduleDir string, entries *android.AndroidMkEntries) {
+			func(w io.Writer, name, prefix, moduleDir string) {
 				// Allow the sdk to be built by simply passing its name on the command line.
 				fmt.Fprintln(w, ".PHONY:", s.Name())
 				fmt.Fprintln(w, s.Name()+":", s.snapshotFile.String())