Revert "Test fscanf of long double without <stdio.h>"

This reverts commit 30a745450e.

On ppc64le, without <stdio.h>, vfscanf is used and with <stdio.h>
__isoc23_vfscanfieee128 is used.  I am reverting this since it doesn't
work on all targets.

stdio-common/Makefile

@@ -193,7 +193,6 @@ tests := \
   scanf18 \
   scanf19 \
   temptest \
-  test-fscanf \
   test-fseek \
   test-fwrite \
   test-popen \

stdio-common/test-fscanf.c

@@ -1,37 +0,0 @@
-/* Test fscanf of long double without <stdio.h>.
-   Copyright (C) 2024 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <string.h>
-
-struct FILE;
-extern struct FILE *stdin;
-extern int fscanf (struct FILE *, const char *, ...);
-
-int
-main (void)
-{
-  int n, i;
-  long double x;
-  char name[50];
-  n = fscanf (stdin, "%d%Lf%s", &i, &x, name);
-
-  if (n != 3 || i != 25 || x != 24.5 || strcmp (name, "thompson"))
-    return 1;
-
-  return 0;
-}

stdio-common/test-fscanf.input

@@ -1 +0,0 @@
-25 24.5 thompson