bblayers.conf: Add meta-mingw layer
bblayers.conf: Add meta-mingw layer

This layer is needed for SDK cross-compiling on Windows.

Signed-off-by: Shruthi Ravichandran <db26f49c821f5e8eba3f4f30a1d200e2416b0696@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt