Fix compiler detection + cross when envvar not set.
Fix compiler detection + cross when envvar not set.

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