Re-added dedicated message if prepare is ran from the MinGW shell.
Re-added dedicated message if prepare is ran from the MinGW shell.

mndrix/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,edechter/swipl-devel,jn7163/swipl-devel,mndrix/swipl-devel,jn7163/swipl-devel,koryonik/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,mndrix/swipl-devel,koryonik/swipl-devel,mndrix/swipl-devel,edechter/swipl-devel,koryonik/swipl-devel,jn7163/swipl-devel,edechter/swipl-devel