native shared libs in an SDK can be snapshotted

The snapshot script can now handle native shared libs in an SDK.

Bug: 138182343
Test: create following sdk module:
sdk {
    name: "mysdk",
    native_shared_libs: ["libc", "libdl"],
}
, then execute `m mysdk` and execute the update_prebuilt-1.sh as
prompted. Following directories are generated under the directory where
mysdk is defined at:

1
├── aidl
├── Android.bp
├── arm64
│   ├── include
│   ├── include_gen
│   └── lib
│       ├── libc.so
│       └── libdl.so
├── include
│   └── bionic
│       └── libc
│           └── include
│               ├── alloca.h
│               ├── android
│               │   ├── api-level.h
<omitted>

Change-Id: Ia1dcc5564c1cd17c6ccf441d06d5995af55db9ee

sdk/sdk.go

@@ -24,6 +24,7 @@ import (
 	// This package doesn't depend on the apex package, but import it to make its mutators to be
 	// registered before mutators in this package. See RegisterPostDepsMutators for more details.
 	_ "android/soong/apex"
+	"android/soong/cc"
 )
 
 func init() {
@@ -148,10 +149,17 @@ func memberMutator(mctx android.BottomUpMutatorContext) {
 
 		targets := mctx.MultiTargets()
 		for _, target := range targets {
-			mctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
-				{Mutator: "image", Variation: "core"},
-				{Mutator: "link", Variation: "shared"},
-			}...), sdkMemberDepTag, m.properties.Native_shared_libs...)
+			for _, lib := range m.properties.Native_shared_libs {
+				name, version := cc.StubsLibNameAndVersion(lib)
+				if version == "" {
+					version = cc.LatestStubsVersionFor(mctx.Config(), name)
+				}
+				mctx.AddFarVariationDependencies(append(target.Variations(), []blueprint.Variation{
+					{Mutator: "image", Variation: "core"},
+					{Mutator: "link", Variation: "shared"},
+					{Mutator: "version", Variation: version},
+				}...), sdkMemberDepTag, name)
+			}
 		}
 	}
 }