fix old name for --disable-single-version-externally-managed option
fix old name for --disable-single-version-externally-managed option

LeMeteore/stdeb,benthomasson/stdeb,sathieu/stdeb,pombredanne/stdeb,sathieu/stdeb,benthomasson/stdeb,LeMeteore/stdeb,pombredanne/stdeb,astraw/stdeb,LeMeteore/stdeb,astraw/stdeb,sathieu/stdeb,pombredanne/stdeb,astraw/stdeb,benthomasson/stdeb