This reverts commit 070e1c859fb2584c3dbe0a6fbe58cbc80938654e, reversing changes made to 3faeda67bb.
3faeda67bb
All scripts in libexec/ (excluding pyenv) are called through pyenv, therefore the shebang lines are not necessary. On some systems this provides a measurable increase in performance of the shell prompt. Related to pyenv/pyenv-virtualenv#259
Imported changes from sstephenson/rbenv#453.