Add generic versions of machine/int_*.h for compilers providing
appropiate macros for all necessary types.

fix wrong integer promotion rule(removed U suffix from UINT{8,16}_C).
see ISO/IEC 9899:1999 7.18.4.3.

put the contents of these header files around #ifdef __x86_64__, and
#include the <i386/foo.h> in the #else clause, making these files
largely bit-size independant.

Remove clause 3 and 4 from TNF licenses

Rename the x86_64 port to amd64, as this is the actual name used for
the processor family now. x86_64 is kept as the MACHINE_ARCH value,
since it's already widely used (by e.g. the toolchain, etc), a

Rename the x86_64 port to amd64, as this is the actual name used for
the processor family now. x86_64 is kept as the MACHINE_ARCH value,
since it's already widely used (by e.g. the toolchain, etc), and
by other operating systems.

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