libreoffice: switch to oe.utils.parallel_make_argument for parallel make
libreoffice: switch to oe.utils.parallel_make_argument for parallel make

Signed-off-by: Andreas Müller <d72a15aaaca3a7afa855175c72dc8d2e05931e32@gmail.com>

schnitzeltony/meta-libreoffice,schnitzeltony/meta-office