devtools: fix meson build test for plain bourne shell

devtools: fix meson build test for plain bourne shell

The pipefail option is not supported in /bin/sh, just in bash/ksh and
similar shells - which means it's there by default on most Linux distros
but not on e.g. FreeBSD. Therefore we check for it's presence before
setting the option, and if it's missing, we upgrade verbosity level if
needed to ensure we never hide any build failures.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Luca Boccassi <bluca@debian.org>