Check wget version iff wget is going to be used
Check wget version iff wget is going to be used

Do not check when tarball is cached

sebhahn/pyenv,sebhahn/pyenv,pyenv/pyenv,pyenv/pyenv,yyuu/pyenv,yyuu/pyenv,cehoffman/pyenv,cehoffman/pyenv,pyenv/pyenv,BanzaiMan/pyenv,sebhahn/pyenv,BanzaiMan/pyenv