Quit callback overwrites the quit callback template (#937)

By default, even if you add a `quit` method in `emscryptenOptions` : 

```
const php = await NodePHP.load( '8.2', { emscriptenOptions : { quit : ( status, toThrow ) => { if( status === 0 ){ process.exit() } return toThrow } } } );
```

 it is overwritten by the actual one on line `57` in `node-php.ts` : 


```
quit: function (code, error) {
	throw error;
},
```

This PR is moving this template callback to be overwritten by
`emscryptenOptions` object given by user.

## What problem is it solving?

To avoid throwing error from `php.exit()` even if it is exiting quietly.


## Testing Instructions

```
const php = await NodePHP.load( '8.2', emscriptenOptions : { quit : ( status, toThrow ) => { if( status === 0 ){ process.exit() } return toThrow } } } );

php.exit(0);
```

This should display nothing.

packages/php-wasm/compile/php/phpwasm-emscripten-library.js

@@ -345,7 +345,6 @@ const LibraryExample = {
 		// Pass data from child process's stderr to PHP's end of the stdout pipe.
 		const stderrStream = SYSCALLS.getStreamFromFD(stderrChildFd);
 		cp.stderr.on('data', function (data) {
-			console.log('Writing error', data.toString());
 			PHPWASM.proc_fds[stderrParentFd].hasData = true;
 			PHPWASM.proc_fds[stderrParentFd].emit('data');
 			stderrStream.stream_ops.write(

packages/php-wasm/node/src/lib/node-php.ts

@@ -48,7 +48,6 @@ export class NodePHP extends BasePHP {
 		return await NodePHP.loadSync(phpVersion, {
 			...options,
 			emscriptenOptions: {
-				...(options.emscriptenOptions || {}),
 				/**
 				 * Emscripten default behavior is to kill the process when
 				 * the WASM program calls `exit()`. We want to throw an
@@ -57,6 +56,7 @@ export class NodePHP extends BasePHP {
 				quit: function (code, error) {
 					throw error;
 				},
+				...(options.emscriptenOptions || {}),
 			},
 		}).phpReady;
 	}

packages/php-wasm/node/src/test/php.spec.ts

@@ -88,7 +88,7 @@ describe.each(SupportedPHPVersions)('PHP %s', (phpVersion) => {
 					$pipes
 				);
 
-				// Yields back to JS event loop to capture and process the 
+				// Yields back to JS event loop to capture and process the
 				// child_process output. This is fine. Regular PHP scripts
 				// typically wait for the child process to finish.
 				sleep(1);
@@ -133,7 +133,7 @@ describe.each(SupportedPHPVersions)('PHP %s', (phpVersion) => {
 		// This test fails
 		if (!['7.0', '7.1', '7.2', '7.3'].includes(phpVersion)) {
 			/*
-			There is a race condition in this variant of the test which 
+			There is a race condition in this variant of the test which
 			causes the following failure (but only sometimes):
 
 				src/test/php.spec.ts > PHP 8.2 > proc_open() > cat – stdin=pipe, stdout=file, stderr=file
@@ -153,7 +153,7 @@ describe.each(SupportedPHPVersions)('PHP %s', (phpVersion) => {
 			);
 			fwrite($pipes[0], 'WordPress\n');
 
-			// Yields back to JS event loop to capture and process the 
+			// Yields back to JS event loop to capture and process the
 			// child_process output. This is fine. Regular PHP scripts
 			// typically wait for the child process to finish.
 			sleep(1);
@@ -184,7 +184,7 @@ describe.each(SupportedPHPVersions)('PHP %s', (phpVersion) => {
 					$pipes
 				);
 
-				// Yields back to JS event loop to capture and process the 
+				// Yields back to JS event loop to capture and process the
 				// child_process output. This is fine. Regular PHP scripts
 				// typically wait for the child process to finish.
 				sleep(1);
@@ -1073,3 +1073,16 @@ describe.each(['7.0', '7.1', '7.3', '7.4', '8.0', '8.1'])(
 		}, 500_000);
 	}
 );
+
+describe.each(SupportedPHPVersions)('PHP %s', (phpVersion) => {
+	describe('emscripten options', () => {
+		it('calls quit callback', async () => {
+			let result = '';
+			const php: NodePHP = await NodePHP.load(phpVersion as any, {
+				emscriptenOptions: { quit: () => (result = 'WordPress') },
+			});
+			php.exit(0);
+			expect(result).toEqual('WordPress');
+		});
+	});
+});