Add symlinks to Soong-installed sh_binary

I3f9928c6d6993c381859b80c335b800b1a9769ee moved sh_binary installation
to Soong, but the Soong install rules didn't include the symlinks.

Bug: 204136549
Test: m checkbuild
Change-Id: I8dd663c7d6a3259b397a11787e0869f32d0530cd
diff --git a/sh/sh_binary.go b/sh/sh_binary.go
index bf97b88..d5033ef 100644
--- a/sh/sh_binary.go
+++ b/sh/sh_binary.go
@@ -275,6 +275,9 @@
 	s.generateAndroidBuildActions(ctx)
 	installDir := android.PathForModuleInstall(ctx, "bin", proptools.String(s.properties.Sub_dir))
 	s.installedFile = ctx.InstallExecutable(installDir, s.outputFilePath.Base(), s.outputFilePath)
+	for _, symlink := range s.Symlinks() {
+		ctx.InstallSymlink(installDir, symlink, s.installedFile)
+	}
 }
 
 func (s *ShBinary) AndroidMkEntries() []android.AndroidMkEntries {