wrap: Check that the package dir contains 'meson'build'
wrap: Check that the package dir contains 'meson'build'

Also use a pathlib.Path object for the checks since it does I/O only
once and is much more efficient anyway. Path objects are available
since Python 3.4, so this is fine.

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