We now at least follow what other Mac applications do.

now bin and share are not pegged to linking the executable any more,
but are proper subdirs targets of their own.
unforturnately, qmake is a bit tenacious, so we hack around a bit. :)

more or less in passing by, i removed some superfluous trailing slashes
and added path normalization as well.

Task:     -
RevBy:    Thorbjorn
AutoTest: -