[MSVC] gstring.h: warning C4141: 'inline': used more than once

When compiling with MSVC we get lots of repeated warnings like:

[1/41] Compiling C object glib/glib-2.0-0.dll.p/gstdio.c.obj
D:\glib\glib/gstring.h(170): warning C4141: 'inline': used more than once
D:\glib\glib/gstring.h(186): warning C4141: 'inline': used more than once
D:\glib\glib/gstring.h(211): warning C4141: 'inline': used more than once

I see that some functions have both G_ALWAYS_INLINE and inline: https://gitlab.gnome.org/GNOME/glib/-/blob/76639a36204ef42ee08cf3736b499dd42f70512e/glib/gstring.h#L173

#ifdef G_CAN_INLINE
G_ALWAYS_INLINE
static inline GString*
g_string_append_c_inline (GString *gstring,
                          gchar    c)
{
  if (G_LIKELY (gstring->len + 1 < gstring->allocated_len))
    {
      gstring->str[gstring->len++] = c;
      gstring->str[gstring->len] = 0;
    }
  else
    g_string_insert_c (gstring, -1, c);
  return gstring;
}

/* ... */

Not sure if there's no harm in removing inline though...