Improve logging when dependency is anonymous
Improve logging when dependency is anonymous

Various pieces of logging assume the dependency has a name, and aren't
grammatical if the dependency is '', so say it is anonymous instead.

jeandet/meson,MathieuDuponchelle/meson,MathieuDuponchelle/meson,becm/meson,MathieuDuponchelle/meson,jeandet/meson,mesonbuild/meson,thiblahute/meson,QuLogic/meson,mesonbuild/meson,mesonbuild/meson,thiblahute/meson,thiblahute/meson,QuLogic/meson,mesonbuild/meson,thiblahute/meson,jeandet/meson,QuLogic/meson,pexip/meson,QuLogic/meson,QuLogic/meson,pexip/meson,QuLogic/meson,jeandet/meson,QuLogic/meson,becm/meson,becm/meson,becm/meson,QuLogic/meson,jpakkane/meson,becm/meson,pexip/meson,pexip/meson,jeandet/meson,MathieuDuponchelle/meson,MathieuDuponchelle/meson,mesonbuild/meson,jeandet/meson,jeandet/meson,MathieuDuponchelle/meson,jpakkane/meson,jpakkane/meson,jpakkane/meson,thiblahute/meson,pexip/meson,jeandet/meson,mesonbuild/meson,MathieuDuponchelle/meson,jpakkane/meson,becm/meson,jpakkane/meson,mesonbuild/meson,pexip/meson,QuLogic/meson,pexip/meson,becm/meson,jpakkane/meson,mesonbuild/meson,jpakkane/meson,MathieuDuponchelle/meson,jpakkane/meson,pexip/meson,becm/meson,thiblahute/meson,MathieuDuponchelle/meson,pexip/meson,becm/meson,thiblahute/meson,pexip/meson,jeandet/meson,mesonbuild/meson,mesonbuild/meson,thiblahute/meson,becm/meson,thiblahute/meson