fix: don't pass any output to the custom target

Author: atlj

packages/react-native-builder-bob/src/index.ts

@@ -589,7 +589,6 @@ async function buildTarget(
       await customTarget({
         options: targetOptions,
         source: path.resolve(root, source),
-        output: path.resolve(root, output, 'typescript'),
         report,
         root,
       });

packages/react-native-builder-bob/src/targets/custom.ts

@@ -5,7 +5,7 @@ import { spawn } from '../utils/spawn';
 import dedent from 'dedent';
 import del from 'del';
 
-type Options = Input & {
+type Options = Omit<Input, 'output'> & {
   options?: {
     script?: string;
     clean?: string;