[Rpm-maint] [rpm-software-management/rpm] Add support for ARM 64bit (aarch64) - Add arm32 and arm64 macros (#173)

[MyungJoo Ham]

%arm, by its name, it is supposed to include armv8 as well, but it is missing and some packages started using it as arm-32bit (upto armv7). At least, the comment in the macro definition meant to be "arm" architectures for both 32/64 bits: `arch macro for all supported ARM processors`

Some packages has started using `%ifarch %arm aarch64` in order to say "if it is arm" and some intend to mean arm 32bit with `%arm`; it is a pity that this commit is so long overdue. Anyway, because there are already too many packages using `%arm` to denote `arm32`, we may need to give `arm_all = arm32 arm64` and `arm = arm32`, allowing to clearly state it's "32bit" or "all arm".

I don't expect all developers to read "macros.in".



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