Promote stl to a fixed feature

cc needs to know what stl was selected, promote stl from a generic
feature implementation to a fixed type pointer.

Change-Id: I950ef947f7cd254fe3074f4ff240bb2b90b9116c
diff --git a/cc/cc.go b/cc/cc.go
index 417dc0d..18dd09c 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -528,6 +528,7 @@
 	compiler   compiler
 	linker     linker
 	installer  installer
+	stl        *stl
 
 	outputFile common.OptionalPath
 
@@ -548,6 +549,9 @@
 	if c.installer != nil {
 		props = append(props, c.installer.props()...)
 	}
+	if c.stl != nil {
+		props = append(props, c.stl.props()...)
+	}
 	for _, feature := range c.features {
 		props = append(props, feature.props()...)
 	}
@@ -627,9 +631,7 @@
 
 func newModule(hod common.HostOrDeviceSupported, multilib common.Multilib) *Module {
 	module := newBaseModule(hod, multilib)
-	module.features = []feature{
-		&stlFeature{},
-	}
+	module.stl = &stl{}
 	return module
 }
 
@@ -653,6 +655,9 @@
 	if c.linker != nil {
 		flags = c.linker.flags(ctx, flags)
 	}
+	if c.stl != nil {
+		flags = c.stl.flags(ctx, flags)
+	}
 	for _, feature := range c.features {
 		flags = feature.flags(ctx, flags)
 	}
@@ -726,6 +731,9 @@
 	if c.linker != nil {
 		c.linker.begin(ctx)
 	}
+	if c.stl != nil {
+		c.stl.begin(ctx)
+	}
 	for _, feature := range c.features {
 		feature.begin(ctx)
 	}
@@ -740,6 +748,9 @@
 	if c.linker != nil {
 		deps = c.linker.deps(ctx, deps)
 	}
+	if c.stl != nil {
+		deps = c.stl.deps(ctx, deps)
+	}
 	for _, feature := range c.features {
 		deps = feature.deps(ctx, deps)
 	}