Refactor factories

Change module factories from returning a blueprint.Module and a list
of property structs to returning an android.Module, which holds the
list of property structs.

Test: build.ninja identical except for Factory: comment lines
Change-Id: Ica1d823f009db812c518f271a386fbff39c9766f

cc/library.go

@@ -108,41 +108,41 @@ func init() {
 
 // Module factory for combined static + shared libraries, device by default but with possible host
 // support
-func libraryFactory() (blueprint.Module, []interface{}) {
+func libraryFactory() android.Module {
 	module, _ := NewLibrary(android.HostAndDeviceSupported)
 	return module.Init()
 }
 
 // Module factory for static libraries
-func libraryStaticFactory() (blueprint.Module, []interface{}) {
+func libraryStaticFactory() android.Module {
 	module, library := NewLibrary(android.HostAndDeviceSupported)
 	library.BuildOnlyStatic()
 	return module.Init()
 }
 
 // Module factory for shared libraries
-func librarySharedFactory() (blueprint.Module, []interface{}) {
+func librarySharedFactory() android.Module {
 	module, library := NewLibrary(android.HostAndDeviceSupported)
 	library.BuildOnlyShared()
 	return module.Init()
 }
 
 // Module factory for host static libraries
-func libraryHostStaticFactory() (blueprint.Module, []interface{}) {
+func libraryHostStaticFactory() android.Module {
 	module, library := NewLibrary(android.HostSupported)
 	library.BuildOnlyStatic()
 	return module.Init()
 }
 
 // Module factory for host shared libraries
-func libraryHostSharedFactory() (blueprint.Module, []interface{}) {
+func libraryHostSharedFactory() android.Module {
 	module, library := NewLibrary(android.HostSupported)
 	library.BuildOnlyShared()
 	return module.Init()
 }
 
 // Module factory for header-only libraries
-func libraryHeaderFactory() (blueprint.Module, []interface{}) {
+func libraryHeaderFactory() android.Module {
 	module, library := NewLibrary(android.HostAndDeviceSupported)
 	library.HeaderOnly()
 	return module.Init()