Add a --symlinks argument to soong_zip

Add a --symlinks argument that defaults to true to soong_zip.
Passing --symlinks=false will cause it to follow symlinks instead
of storing them in the zip file.

Relands I4deb98daa9d4ba9f94e3d7670c117fe00381d2ba with tests.

Bug: 112843624
Test: glob_test.go
Test: zip_test.go
Test: m checkbuild
Change-Id: I0eff9c1f2dba79e873fda381ff585df55d5aaaad

zip/cmd/main.go

@@ -137,6 +137,8 @@ func main() {
 	emulateJar := flags.Bool("jar", false, "modify the resultant .zip to emulate the output of 'jar'")
 	writeIfChanged := flags.Bool("write_if_changed", false, "only update resultant .zip if it has changed")
 
+	symlinks := flags.Bool("symlinks", true, "store symbolic links in zip instead of following them")
+
 	parallelJobs := flags.Int("parallel", runtime.NumCPU(), "number of parallel threads to use")
 	cpuProfile := flags.String("cpuprofile", "", "write cpu profile to file")
 	traceFile := flags.String("trace", "", "write trace to file")
@@ -197,9 +199,10 @@ func main() {
 		NumParallelJobs:          *parallelJobs,
 		NonDeflatedFiles:         nonDeflatedFiles,
 		WriteIfChanged:           *writeIfChanged,
+		StoreSymlinks:            *symlinks,
 	})
 	if err != nil {
-		fmt.Fprintln(os.Stderr, err.Error())
+		fmt.Fprintln(os.Stderr, "error:", err.Error())
 		os.Exit(1)
 	}
 }