tests/186: Make work with apple ld's -fatal_warnings
tests/186: Make work with apple ld's -fatal_warnings

the fact that foo and bar are not directories makes Apple's ld upset, and with
fatal warnings it dies on this test. Using real directories makes it happy.

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