[oe] [meta-oe][PATCH] Meson update and fix

[Adam Foltzer]

Hi everyone,

These patches respectively fix some issues with the Meson bitbake class,
and update the devtool recipe to the latest version. These issues arose
when creating a new recipe for a C++ project that uses Meson, but the
additional linker flags should help with C recipes as well.

The diffs are available here:
https://github.com/openembedded/meta-openembedded/compare/master...acfoltzer:meson-updates

Regards,
Adam

PS. I hope this is the right way to submit a patch like this; I'm happy to
submit it in other forms as well if it'd be useful.