Enforce min_sdk_version of apex(use_vendor:true)

Even though use_vendor:true is prohibited, there is media.swcodec apex
which is still use_vendor: true and also needs to support Android10.
(min_sdk_version: 29)

Because LLNDK stubs were provided only for the current VNDK version,
media.swcodec couldn't be built against min_sdk_version: 29.

This change introduces additional versions for LLNDK stubs which are
enforced when an apex with use_vendor: true sets min_sdk_version.

To make things easier, the versions of LLNDK stubs are borrowed from its
implementation libraries.

Bug: 147450930
Bug: 149591522
Test: TARGET_BUILD_APPS=com.android.media.swcodec m
      (with min_sdk_version: 29 set)
      check if liblog/libc/libm/libdl stubs are 29
      check if 29 stubs don't have new symbols.

Change-Id: I79946cbb4da6617138a96d2b254349d3a298e77b

cc/llndk_library.go

@@ -19,8 +19,14 @@ import (
 	"strings"
 
 	"android/soong/android"
+
+	"github.com/google/blueprint"
 )
 
+var llndkImplDep = struct {
+	blueprint.DependencyTag
+}{}
+
 var (
 	llndkLibrarySuffix = ".llndk"
 	llndkHeadersSuffix = ".llndk"
@@ -81,6 +87,9 @@ func (stub *llndkStubDecorator) compile(ctx ModuleContext, flags Flags, deps Pat
 		// For non-enforcing devices, vndkVer is empty. Use "current" in that case, too.
 		vndkVer = "current"
 	}
+	if stub.stubsVersion() != "" {
+		vndkVer = stub.stubsVersion()
+	}
 	objs, versionScript := compileStubLibrary(ctx, flags, String(stub.Properties.Symbol_file), vndkVer, "--llndk")
 	stub.versionScriptPath = versionScript
 	return objs
@@ -154,6 +163,10 @@ func (stub *llndkStubDecorator) link(ctx ModuleContext, flags Flags, deps PathDe
 		stub.libraryDecorator.flagExporter.Properties.Export_include_dirs = []string{}
 	}
 
+	if stub.stubsVersion() != "" {
+		stub.reexportFlags("-D" + versioningMacroName(ctx.baseModuleName()) + "=" + stub.stubsVersion())
+	}
+
 	return stub.libraryDecorator.link(ctx, flags, deps, objs)
 }