Draft: abuild: simplify cross strip
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Awaiting comment on why the code was added in the first place: f459607d (comment 399364)
Looking through all code paths I came to this conclusion:
${subpkgarch:-$pkgarch} can only ever be noarch or $CARCH.
Since noarch is already checked for it can only be $CARCH when
entering the case statement. This means the second case statement always
matches and the third one can be removed. The second and first case
statement do the same thing as $CROSS_COMPILE. The value is
${CHOST}- when $CBUILD_ARCH and $CARCH don't match.
Partially reverts f459607da76