meson_install.py: Start by checking if the shebang is directly runnable
meson_install.py: Start by checking if the shebang is directly runnable

If it's just runnable as-is, then we don't need to do fancy basename detection
and such to find the interpretor to use for running the script.

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