examples : fix tautological-compare warning in stb_vorbis.c [no ci]

This commit applies a fix to address a tautological-compare warning
in stb_vorbis.c.

The motivation for this is that currently the following warning is
generated when compiling the commmand-wasm example:
```console
/Users/danbev/work/ai/whisper-work/examples/stb_vorbis.c:1404:75: warning: pointer comparison always evaluates to false [-Wtautological-compare]
 1404 |       if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {
      |                                                                           ^
1 warning generated.
```

This fix was taken from an open pull request on the stb repository
that addreses this issue:
nothings/stb#1746

Author: danbev

examples/stb_vorbis.c

@@ -1401,7 +1401,7 @@ static int set_file_offset(stb_vorbis *f, unsigned int loc)
    #endif
    f->eof = 0;
    if (USE_MEMORY(f)) {
-      if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {
+      if (loc >= f->stream_len) {
          f->stream = f->stream_end;
          f->eof = 1;
          return 0;