arch/powerpc: add powerpc64le support

Technically, I don't forbid powerpcle support either, but I'm not sure that
there is any library/compiler support for that at the moment (though the hw
technically makes it possible).

powerpc64le needs glibc 2.19 and gcc 4.9. I haven't looked into the support
tools, but at least gdb 7.5 is too old (7.7.1 definitely has support).

Also make powerpc64 non-experimental. It's practically old at this point.

Signed-off-by: Cody P Schafer <dev@codyps.com>
[yann.morin.1998@free.fr: use ${target_endian_le} and ${target_bits_64}]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Message-Id: <64bfbbced9dd8f62e0d6.1399801945@gun>
Patchwork-Id: 347775

2007-03-13  Mike Frysinger  <vapier@gentoo.org>

	* sysdeps/unix/sysv/linux/sh/sys/procfs.h: Copy Linux's asm-sh/elf.h types.

--- glibc-2_9/sysdeps/unix/sysv/linux/sh/sys/procfs.h

+++ glibc-2_9/sysdeps/unix/sysv/linux/sh/sys/procfs.h

@@ -29,10 +29,19 @@

 #include <sys/types.h>

 #include <sys/ucontext.h>

 #include <sys/user.h>

-#include <asm/elf.h>

 __BEGIN_DECLS

+/*

+ * ELF register definitions...

+ */

+typedef unsigned long elf_greg_t;

+

+#define ELF_NGREG (sizeof (struct pt_regs) / sizeof(elf_greg_t))

+typedef elf_greg_t elf_gregset_t[ELF_NGREG];

+

+typedef struct user_fpu_struct elf_fpregset_t;

+

 struct elf_siginfo

   {

     int si_signo;			/* Signal number.  */