Concatenate string literals in get_define
Concatenate string literals in get_define

If get_define returns a list of string_literals concatenate them into
one string.

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