Move default is_linkable_target method up from BuildTarget to Target
Move default is_linkable_target method up from BuildTarget to Target

BuildTarget.link() assumes that it can call is_linkable_target() on any
objects which are a subclass of Target

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