toolchain/gdb: backport patch for macOS to fix invalid range

toolchain/gdb: backport patch for macOS to fix invalid range

With the recent macOS update to Ventura, it looks like gdb could not be
compiled with clang16 and newer version, because it fails with:
./../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 15] for this enumeration type [-Wenum-constexpr-conversion]
    integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
                                                   ^
./../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 1] for this enumeration type [-Wenum-constexpr-conversion]
./../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 3] for this enumeration type [-Wenum-constexpr-conversion]
./../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 3] for this enumeration type [-Wenum-constexpr-conversion]
4 errors generated.

- Upstream bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=30423

- Backported upstream commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ae61525fcf456ab395d55c45492a106d1275873a

Fixes: https://github.com/openwrt/openwrt/issues/15314
Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/15315
Signed-off-by: Robert Marko <robimarko@gmail.com>