backends: Don't exclude system libraries for PATH
backends: Don't exclude system libraries for PATH

We reuse the same function for generating PATH, and we don't want to
exclude system paths there for obvious reasons.

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