Remove extraneous os.path.split()s.
Remove extraneous os.path.split()s.

Since only one part is needed, they can be replaced by dirname,
basename, or the originally joined file name.

ernestask/meson,QuLogic/meson,fmuellner/meson,MathieuDuponchelle/meson,wberrier/meson,ernestask/meson,jeandet/meson,trhd/meson,jeandet/meson,pexip/meson,thiblahute/meson,QuLogic/meson,trhd/meson,fmuellner/meson,jpakkane/meson,jpakkane/meson,pexip/meson,ernestask/meson,ernestask/meson,jpakkane/meson,aaronp24/meson,aaronp24/meson,pexip/meson,trhd/meson,mesonbuild/meson,trhd/meson,fmuellner/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,ernestask/meson,ernestask/meson,jpakkane/meson,QuLogic/meson,pexip/meson,wberrier/meson,fmuellner/meson,fmuellner/meson,mesonbuild/meson,jeandet/meson,pexip/meson,thiblahute/meson,jeandet/meson,becm/meson,becm/meson,thiblahute/meson,aaronp24/meson,wberrier/meson,jpakkane/meson,jeandet/meson,MathieuDuponchelle/meson,mesonbuild/meson,thiblahute/meson,becm/meson,aaronp24/meson,aaronp24/meson,QuLogic/meson,wberrier/meson,trhd/meson,mesonbuild/meson,ernestask/meson,aaronp24/meson,mesonbuild/meson,thiblahute/meson,jpakkane/meson,MathieuDuponchelle/meson,ernestask/meson,aaronp24/meson,QuLogic/meson,becm/meson,ernestask/meson,trhd/meson,thiblahute/meson,wberrier/meson,MathieuDuponchelle/meson,fmuellner/meson,jeandet/meson,jeandet/meson,pexip/meson,wberrier/meson,fmuellner/meson,aaronp24/meson,MathieuDuponchelle/meson,wberrier/meson,thiblahute/meson,pexip/meson,becm/meson,jeandet/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,becm/meson,becm/meson,thiblahute/meson,trhd/meson,becm/meson,QuLogic/meson,mesonbuild/meson,becm/meson,MathieuDuponchelle/meson,trhd/meson,wberrier/meson,becm/meson,fmuellner/meson,pexip/meson,MathieuDuponchelle/meson,QuLogic/meson,aaronp24/meson,trhd/meson,jpakkane/meson,thiblahute/meson,MathieuDuponchelle/meson,fmuellner/meson,pexip/meson,MathieuDuponchelle/meson,QuLogic/meson,pexip/meson,mesonbuild/meson,jeandet/meson