[dylink] Fix addEmJs when parameter is indirect pointer (emscripten-core#25740)

I'm in the middle of porting [libskk](https://github.com/ueno/libskk)
with glib, and encountered a `SyntaxError: Unexpected token '*'`.
Given the value of `cSig`, `jsArg` and `jsArgs` in debugger view, it
seems straightforward.

<img width="972" height="251"
src="https://github.com/user-attachments/assets/71d04fcb-ab51-4c38-89a5-0abf77136bf8"
/>

Author: eagleoflqj

src/lib/libdylink.js

@@ -880,7 +880,7 @@ var LibraryDylink = {
             cSig = cSig.split(',');
             for (var arg of cSig) {
               var jsArg = arg.split(' ').pop();
-              jsArgs.push(jsArg.replace('*', ''));
+              jsArgs.push(jsArg.replaceAll('*', ''));
             }
           }
           var func = `(${jsArgs}) => ${body};`;

test/codesize/test_codesize_hello_dylink.json

@@ -1,10 +1,10 @@
 {
-  "a.out.js": 26546,
-  "a.out.js.gz": 11349,
+  "a.out.js": 26549,
+  "a.out.js.gz": 11353,
   "a.out.nodebug.wasm": 17761,
   "a.out.nodebug.wasm.gz": 9003,
-  "total": 44307,
-  "total_gz": 20352,
+  "total": 44310,
+  "total_gz": 20356,
   "sent": [
     "__syscall_stat64",
     "emscripten_resize_heap",

test/codesize/test_codesize_hello_dylink_all.json

@@ -1,7 +1,7 @@
 {
-  "a.out.js": 245299,
+  "a.out.js": 245302,
   "a.out.nodebug.wasm": 574162,
-  "total": 819461,
+  "total": 819464,
   "sent": [
     "IMG_Init",
     "IMG_Load",

test/other/test_em_js_main.out

@@ -2,3 +2,4 @@ in main
 hello from side module 42 + hello
 hello again
 hello from void func
+hello

test/other/test_em_js_side.c

@@ -14,9 +14,15 @@ EM_JS(void, js_side_func_void, (), {
   out(`hello from void func`);
 });
 
+EM_JS(void, js_side_func_indirect_ptr, (const char **pptr), {
+  out(UTF8ToString(getValue(pptr, '*')));
+});
+
 int test_side() {
+  const char *hello = "hello";
   js_side_func(42, "hello");
   js_side_func2("hello again");
   js_side_func_void();
+  js_side_func_indirect_ptr(&hello);
   return 0;
 }