rpm: Always set b_ndebug to true
rpm: Always set b_ndebug to true

'if-release' does not catch buildtype=plain, so we need to do this.

Signed-off-by: Igor Gnatenko <c869b0bfe2cf1da26c2efd33f6d6d74ddcbbdd2b@gmail.com>

becm/meson,becm/meson,becm/meson,pexip/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,becm/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,jpakkane/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,QuLogic/meson,jpakkane/meson,pexip/meson,QuLogic/meson,pexip/meson,QuLogic/meson,pexip/meson,becm/meson,becm/meson,becm/meson,becm/meson,jpakkane/meson,QuLogic/meson,jpakkane/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,jpakkane/meson,pexip/meson,becm/meson,pexip/meson,becm/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson