build: use bare (and portable) echo instead of echo -n

[imp]

Summary

There's no need to use echo -n here. A single echo will do nicely.
This fixes the post-buildworld output on a macos build, where echo -n
is implemented like System V instead of BSD (so you get two lines
first one starting with -n).

Sponsored by: Netflix

[jrtc27]

s/echo -n/printf '%s'/ is the other option, but this seems like the sensible approach here.

[emaste]

Makefile.inc1

1811

or just extend the line beyond 80 cols?

[imp]

Makefile.inc1

1811

interesting notion, but this file is mostly < 80 already and this extends it too far past... At least at the moment... Maybe in the future.

[emaste]

this extends it too far past

IMO for log messages etc. we should generally prefer not wrapping them and ignore line lengths, so that if someone can find them when doing e.g. grep "seconds, ncpu"

[emaste]

anyway I don't object to this, it's an improvement

[imp]

Makefile.inc1

1811

OK. I mulled it and decided that > 80 columns isn't a big deal and it mostly looks better anyway...