remove libdecnumber/dpd/decimal128Local.h

Commit 72ac97cdfc added two equivalent versions of decimal128Local.h,
one in libdecnumber/dpd/ and another in include/libdecnumber/dpd/.
Being identical by the code, the two files however differs in the
licensing terms.  The one in libdecnumber/dpd/ (which is being
removed by this patch) is licensed as GPL3.1 (plus gcc runtime
exception), which, as far as I know, is not compatible with GPL-2.
This file is not used (it is included from
include/libdecnumber/dpd/decimal128.h, so version in include/ is
used).

More, the version in include/ can also be removed, since none
of the 3 defines from that file are actually used by the code.
Even more, one of the defines from there, decimal128SetSign,
is redefined (to equivalent value) in libdecnumber/dpd/decimal128.c,
but again, never used.

What a mess...

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

libdecnumber/dpd/decimal128Local.h

@@ -1,42 +0,0 @@
-/* Local definitions for use with the decNumber C Library.
-   Copyright (C) 2007, 2009 Free Software Foundation, Inc.
-
-   This file is part of GCC.
-
-   GCC is free software; you can redistribute it and/or modify it under
-   the terms of the GNU General Public License as published by the Free
-   Software Foundation; either version 3, or (at your option) any later
-   version.
-
-   GCC 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 General Public License
-   for more details.
-
-Under Section 7 of GPL version 3, you are granted additional
-permissions described in the GCC Runtime Library Exception, version
-3.1, as published by the Free Software Foundation.
-
-You should have received a copy of the GNU General Public License and
-a copy of the GCC Runtime Library Exception along with this program;
-see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
-<http://www.gnu.org/licenses/>.  */
-
-#if !defined(DECIMAL128LOCAL)
-
-/* The compiler needs sign manipulation functions for decimal128 which
-   are not part of the decNumber package.  */
-
-/* Set sign; this assumes the sign was previously zero.  */
-#define decimal128SetSign(d,b) \
-  { (d)->bytes[WORDS_BIGENDIAN ? 0 : 15] |= ((unsigned) (b) << 7); }
-
-/* Clear sign.  */
-#define decimal128ClearSign(d) \
-  { (d)->bytes[WORDS_BIGENDIAN ? 0 : 15] &= ~0x80; }
-
-/* Flip sign.  */
-#define decimal128FlipSign(d) \
-  { (d)->bytes[WORDS_BIGENDIAN ? 0 : 15] ^= 0x80; }
-
-#endif