trees: match gcc/gnat versions both ways

on debian trixie/sid after updating from stable,
sometimes gcc 13 and gnat 13 are both available, but
gcc resolves to gcc-14 and gnat-14 isn't available.

even when gnat-14 and gcc-14 are available, gnat will
still either resolve to gnat-13, or nothing at all.

in cases where gnat-14 is unavailable, but gcc and gnat 13
are both available, we should match gcc to gnat.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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