New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/pull/33828#issuecomment-955571847

Comment:
```
FLTK/fl_callbacks.cpp: In function 'void button_record_cb()':
FLTK/fl_callbacks.cpp:915:30: error: 'PATH_MAX' was not declared in this scope
  915 |     char expanded_rec_folder[PATH_MAX];
      |                              ^~~~~~~~
FLTK/fl_callbacks.cpp:935:24: error: 'expanded_rec_folder' was not declared in this scope
  935 |     fl_filename_expand(expanded_rec_folder, sizeof(expanded_rec_folder), cfg.rec.folder);
      |                        ^~~~~~~~~~~~~~~~~~~
```

missing `#include <limits.h>` in that file.