Add platform check file in phars, fixes #8813
Add platform check file in phars, fixes #8813

composer/composer,pierredup/composer,floverdevel/composer,fabpot/composer,johnstevenson/composer,stefangr/composer,milleruk/composer,nicolas-grekas/composer,localheinz/composer,stof/composer,alcohol/composer,staabm/composer,naderman/composer