Had been totaly broken by the recent changes. (Which is fine, it is
just an experimental hack anyway, I am not sure whether it will ever
be used in anger. Just a pet peeve of mine, I dislike seeing
libraries, configuration files, resources etc mixed together in one
"program" folder, especially on OS X, where the convention is to have
app-specific dylibs and frameworks in "Frameworks", and resource files
in "Resources". But this is not any requirement as such; there are
apps in the Mac App Store that blatantly "break" this convention.)

Basically, replace uses of gb_PROGRAMDIRNAME and
gb_Package_PROGRAMDIRNAME with more specific LIBO_FOO_FOLDER, which
for normal builds all expand to the same "program" anyway.

Change-Id: I16c2b3351caa00e251e229aafbccb8346042d3c1