Wrap PackageContext and SingletonContext

Wrap blueprint.PackageContext so that the *Func methods can provide
an android.Config instead of an interface{}.  The modified signatures
means that every method in ModuleContext and SingletonContext
that takes a blueprint.PackageContext now needs to be wrapped to
take an android.PackageContext.

SingletonContext wasn't previously wrapped at all, but as long
as it is, wrap everything like ModuleContext does.  This requires
updating every Singleton to use the android-specific methods.

Test: builds, all Soong tests pass
Change-Id: I4f22085ebca7def6c5cde49e8210b59d994ba625

android/makevars.go

@@ -21,7 +21,6 @@ import (
 	"os"
 	"strconv"
 
-	"github.com/google/blueprint"
 	"github.com/google/blueprint/proptools"
 )
 
@@ -66,7 +65,7 @@ type MakeVarsContext interface {
 
 type MakeVarsProvider func(ctx MakeVarsContext)
 
-func RegisterMakeVarsProvider(pctx blueprint.PackageContext, provider MakeVarsProvider) {
+func RegisterMakeVarsProvider(pctx PackageContext, provider MakeVarsProvider) {
 	makeVarsProviders = append(makeVarsProviders, makeVarsProvider{pctx, provider})
 }
 
@@ -76,14 +75,14 @@ func init() {
 	RegisterSingletonType("makevars", makeVarsSingletonFunc)
 }
 
-func makeVarsSingletonFunc() blueprint.Singleton {
+func makeVarsSingletonFunc() Singleton {
 	return &makeVarsSingleton{}
 }
 
 type makeVarsSingleton struct{}
 
 type makeVarsProvider struct {
-	pctx blueprint.PackageContext
+	pctx PackageContext
 	call MakeVarsProvider
 }
 
@@ -91,8 +90,8 @@ var makeVarsProviders []makeVarsProvider
 
 type makeVarsContext struct {
 	config Config
-	ctx    blueprint.SingletonContext
-	pctx   blueprint.PackageContext
+	ctx    SingletonContext
+	pctx   PackageContext
 	vars   []makeVarsVariable
 }
 
@@ -105,7 +104,7 @@ type makeVarsVariable struct {
 	strict bool
 }
 
-func (s *makeVarsSingleton) GenerateBuildActions(ctx blueprint.SingletonContext) {
+func (s *makeVarsSingleton) GenerateBuildActions(ctx SingletonContext) {
 	config := ctx.Config().(Config)
 
 	if !config.EmbeddedInMake() {