libc/mingw: replace mingw32 with generic mingw

Replace the 32-bit-only mingw32 with mingw-w64 that is capable
of building toolchains for both 32-bit and 64-bit Windows.

kernel/mingw: replace mingw32 with generic Windows
kernel/windows: New windows kernel supporting 32 and 64 bit arch
libc/mingw: Remove old options
patches: Remove old mingw libc options' patches

Signed-off-by: "Yann Diorcet" <diorcet.yann@gmail.com>
[yann.morin.1998@free.fr: array var in libc/mingw.sh, typos]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <b045ac08fc9eac2e5ee3.1352898499@blackmint>
Patchwork-Id: 198901

 diff -dur binutils-2.17.old/bfd/opncls.c binutils-2.17/bfd/opncls.c

 --- binutils-2.17.old/bfd/opncls.c	2006-03-16 13:20:16.000000000 +0100

 +++ binutils-2.17/bfd/opncls.c	2007-05-01 18:26:11.000000000 +0200

 @@ -158,6 +158,13 @@

  {

    bfd *nbfd;

    const bfd_target *target_vec;

 +  struct stat s;

 +

 +  if (stat (filename, &s) == 0)

 +    if (S_ISDIR(s.st_mode)) {

 +      bfd_set_error (bfd_error_file_not_recognized);

 +      return NULL;

 +    }

    nbfd = _bfd_new_bfd ();

    if (nbfd == NULL)