Fix inttypes.h and stdint.h for 64-bit (and C++11).

Change-Id: I394630348413c9aafcac137ce1ca5f0a93d9ab6f
Add x86_64 to the bionic headers.

Manual changes:

  cpp.py: cope with macros that refer to other macros.

  defaults.py: x86 no longer always implies __i386__; use __i386__ to replace
  the kernel CONFIG_X86_32 flag.

  asm/page.h: the upstream page.h isn't a uapi header and no longer includes
  the stuff we were using it for. Let's just have our own static file, since
  it's the same for all our architectures (both 32- and 64-bit).

  sys/select.h: we used to use the various FD_SET-related macros from the
  kernel header files, but they've gone. Adjust by adding trivial equivalent
  definitions.

Automated changes:

  libc/kernel/arch-x86, libc/kernel/common: regenerated from
  external/kernel-headers.

Change-Id: I84fc0ed52dc742e043b4ae300fd3b58ee99b7fcd
Fix x86 build.

Change-Id: I1f2d8189bec3d0e25d21ca7d7bd73fd02f8678e2
Better statfs/fstatfs glibc compatibility.

Change-Id: I069d169c96cd71b75a045ec911fb4bd484c6b2c9
Remove 32-bit assumptions from the ELF code.

Change-Id: I2c1f3d34c33685799aade8866eec44479ff9f963
Clean up some comments.

Copyright headers shouldn't contain the filename (and especially
shouldn't contain a different file's filename).

Change-Id: I82690a3bf371265402bc16f5d2fbb9299c3a1926