Universal binary support in scons on mac

[bugsyv]

Should be fixed shortly if someone hasn't gotten to it before me.

Actually, reviewing the file before my changes...

default_datadir and default_bindir have the same values that were applied directly to the option.Add(PathOption()) for the options in question before...

So I am not quite sure how stuff was getting installed to the locations indicated.

Since, I don't work on this platform, I will defer the decision to change the default values to someone who does.

alex25, if you don't like the default values, you can always change them when running scons:

Code:

$ scons datadir=share/games/vdrift bindir=bin

You only have to do this once because the settings are persisted and automatically applied during subsequent builds.