Revert "Fixed an issue when a phar file is used in "files" option in composer.json"
Revert "Fixed an issue when a phar file is used in "files" option in composer.json"

This reverts commit 41e91f3064cee51dd52f45831dc48748ce37a095.

The commit 41e91f3 in current codebase generates absolute path in
autoload_static.php for phar file.

Also according to http://php.net/manual/en/phar.using.intro.php, the `phar://`
prefix is not needed.

localheinz/composer,floverdevel/composer,alcohol/composer,stefangr/composer,composer/composer,stof/composer,staabm/composer,gencer/composer,naderman/composer,SpacePossum/composer,nicolas-grekas/composer,fabiang/composer,dzuelke/composer,milleruk/composer,vdm-io/composer,andrerom/composer,slbmeh/composer,pierredup/composer,erasys/composer,fabpot/composer,johnstevenson/composer