pkg: Allocate a suitably-sized string for the local ABI

[jhb]

Summary

Previously the local ABI string was written to an on-stack buffer and
the pointer to that buffer was saved in a global before the function
returned. This had two issues: c[ABI].val pointed to a
no-longer-valid on-stack buffer after config_init returned, and the
string could potentially be truncated. Fix both of those by changing
pkg_get_myabi to return a pointer to a string allocated by asprintf.

Reported by: GCC 13 -Wdangling-pointer

[jhb]

This is an alternative to D42583.

[emaste]

Worth noting that we just let the storage be freed upon exit?