bsd.cpu.mk: Fix whitespace appending to MACHINE_ABI

[brooks]

Summary

Effort: CHERI upstreaming
Sponsored by: Innovate UK
Fixes: 426fc376afaf ("bsd.cpu.mk: Introduce MACHINE_ABI")

[imp]

Fun. Commit message could be better at explaining why this happens with the old code

[brooks]

In D52833#1207103, @imp wrote:

Fun. Commit message could be better at explaining why this happens with the old code

There's no functional change. It's just that I copied and pasted without tabs.

[imp]

In D52833#1207111, @brooks wrote:

In D52833#1207103, @imp wrote:

Fun. Commit message could be better at explaining why this happens with the old code

There's no functional change. It's just that I copied and pasted without tabs.

Ah! I thought it has other implications...