Add sh_binary[_host] for shell script that should be installed as executable

We've been putting these in cc_prebuilt_binary, but that's not really
correct. It also tries adding '.exe' to the end of windows executables,
which isn't desirable for bat files.

Test: Use sh_binary_host
Change-Id: Idd5418dceb81ac55b766c987fbb69a810aeb8a3b

android/prebuilt_etc.go

@@ -125,7 +125,8 @@ func (p *PrebuiltEtc) GenerateAndroidBuildActions(ctx ModuleContext) {
 	p.outputFilePath = PathForModuleOut(ctx, filename).OutputPath
 	p.installDirPath = PathForModuleInstall(ctx, "etc", String(p.properties.Sub_dir))
 
-	// This ensures that outputFilePath has the same name as this module.
+	// This ensures that outputFilePath has the correct name for others to
+	// use, as the source file may have a different name.
 	ctx.Build(pctx, BuildParams{
 		Rule:   Cp,
 		Output: p.outputFilePath,