asm-x86/* exported headers using CONFIG_X86_32

[Arnd Bergmann]

While looking through the new header files, I noticed lots of occurences
of #ifdef CONFIG_X86_32 in headers files exported for glibc.

This is fundamentally broken because user applications including them
do not know about any CONFIG_* symbols, and if they did, those
would incorrectly describe the ABI.

I guess in most cases, the headers that are interesting to user space
can simply be merged without any such #ifdef remaining, but those
that are still needed should be converted to use #ifdef __x86_64__,
which is set by the compiler.
This is how the other architectures avoid this particular problem.

	Arnd <><
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