cmd/gomobile: rename pkgImportsAudio to pkgImportsAL

We are determining whether to add libopenal.so dependending on the
al package imports. The names must suggest we are looking for the
al package rather than the audio.

Change-Id: Ib6896302238ff1ebe135f004b134911a0c340821
Reviewed-on: https://go-review.googlesource.com/11680
Reviewed-by: David Crawshaw <crawshaw@golang.org>

cmd/gomobile/build.go

@@ -216,8 +216,8 @@ func runBuild(cmd *command) (err error) {
 		}
 	}
 
-	importsAudio := pkgImportsAudio(pkg)
-	if importsAudio {
+	importsAL := pkgImportsAL(pkg)
+	if importsAL {
 		alDir := filepath.Join(ndkccpath, "openal/lib")
 		filepath.Walk(alDir, func(path string, info os.FileInfo, err error) error {
 			if err != nil {
@@ -424,28 +424,28 @@ func goAndroidBuild(src, libPath string) error {
 	return nil
 }
 
-var importsAudioPkgs = make(map[string]struct{})
+var importsALPkg = make(map[string]struct{})
 
-// pkgImportsAudio returns true if the given package or one of its
-// dependencies imports the mobile/audio package.
-func pkgImportsAudio(pkg *build.Package) bool {
+// pkgImportsAL returns true if the given package or one of its
+// dependencies imports the x/mobile/exp/audio/al package.
+func pkgImportsAL(pkg *build.Package) bool {
 	for _, path := range pkg.Imports {
 		if path == "C" {
 			continue
 		}
-		if _, ok := importsAudioPkgs[path]; ok {
+		if _, ok := importsALPkg[path]; ok {
 			continue
 		}
-		importsAudioPkgs[path] = struct{}{}
+		importsALPkg[path] = struct{}{}
 		if strings.HasPrefix(path, "golang.org/x/mobile/exp/audio/al") {
 			return true
 		}
 		dPkg, err := ctx.Import(path, "", build.ImportComment)
 		if err != nil {
-			fmt.Fprintf(os.Stderr, "error while looking up for the audio package: %v", err)
+			fmt.Fprintf(os.Stderr, "error reading OpenAL library: %v", err)
 			os.Exit(2)
 		}
-		if pkgImportsAudio(dPkg) {
+		if pkgImportsAL(dPkg) {
 			return true
 		}
 	}