libiberty/testsuite: Avoid conflicting getline()

*** 44,54 ****
  /* Safely read a single line of arbitrary length from standard input.  */
  
  #define LINELEN 80
  
  static void
! getline(buf)
       struct line *buf;
  {
    char *data = buf->data;
    size_t alloc = buf->alloced;
    size_t count = 0;
--- 44,54 ----
  /* Safely read a single line of arbitrary length from standard input.  */
  
  #define LINELEN 80
  
  static void
! _getline(buf)
       struct line *buf;
  {
    char *data = buf->data;
    size_t alloc = buf->alloced;
    size_t count = 0;
*** 194,209 ****
  
    for (;;)
      {
        const char *inp;
        
!       getline (&format);
        if (feof (stdin))
          break;
  
!       getline (&input);
!       getline (&expect);
  
        inp = protect_end (input.data);
  
        tests++;
  
--- 194,209 ----
  
    for (;;)
      {
        const char *inp;
        
!       _getline (&format);
        if (feof (stdin))
          break;
  
!       _getline (&input);
!       _getline (&expect);
  
        inp = protect_end (input.data);
  
        tests++;
  
*** 320,330 ****
          }
        free (result);
  
        if (no_params)
          {
!           getline (&expect);
            result = cplus_demangle (inp, DMGL_ANSI|DMGL_TYPES);
  
            if (result
                ? strcmp (result, expect.data)
                : strcmp (input.data, expect.data))
--- 320,330 ----
          }
        free (result);
  
        if (no_params)
          {
!           _getline (&expect);
            result = cplus_demangle (inp, DMGL_ANSI|DMGL_TYPES);
  
            if (result
                ? strcmp (result, expect.data)
                : strcmp (input.data, expect.data))