cmd: Explicitly mark qsort() callback funtions cdecl.

programs/cmd/builtins.c

@@ -3562,7 +3562,7 @@ void WCMD_setshow_date (void) {
  * Note: Native displays 'fred' before 'fred ', so need to only compare up to
  *       the equals sign.
  */
-static int WCMD_compare( const void *a, const void *b )
+static int __cdecl WCMD_compare( const void *a, const void *b )
 {
     int r;
     const WCHAR * const *str_a = a, * const *str_b = b;

programs/cmd/directory.c

@@ -101,7 +101,7 @@ static WCHAR * WCMD_filesize64 (ULONGLONG n) {
  *
  * Sort based on the /O options supplied on the command line
  */
-static int WCMD_dir_sort (const void *a, const void *b)
+static int __cdecl WCMD_dir_sort (const void *a, const void *b)
 {
   const WIN32_FIND_DATAW *filea = (const WIN32_FIND_DATAW *)a;
   const WIN32_FIND_DATAW *fileb = (const WIN32_FIND_DATAW *)b;