meson.bbclass: Make the default buildtype "debug" if DEBUG_BUILD is 1
Setting the Meson buildtype to "debug" will by default only enable the
-g option to the compiler, which should not matter for OE-Core as it is
already enabled by setting DEBUG_BUILD to 1 in the first place. However,
if the package uses get_option('debug') in its meson.build files to
enable package specific debug code, this will now trigger as intended.
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
