patch applied (cabal): Only create includes and bin dirs if necessary

Fri Aug 24 08:27:49 PDT 2007 Duncan Coutts * Only create includes and bin dirs if necessary For includes, don't list the include dir in the package registration info unless we're actually going to install some include files. So we should create fewer pointless empty directories. See bug #97. M ./Distribution/Simple/Install.hs -8 +10 M ./Distribution/Simple/Register.hs -1 +3