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Added support for building 'extra' object files.
Added support for building targetutils.
Hack: Changed TARGET order to have apple2enh.lib available for convert.system.

There's a quite special case of a targetutil for the TARGET geos-apple having to be
built as TARGET apple2enh binary. We can't just add a dependency to ../lib/apple2enhlib
because the TARGETs are built in individual make instances (because of vpath).

Doing that the "right way" would be _very_ complicated and would turn the Makefiles way
less readable. Therefore I decided to solve that by just reordering the TARGETs. Surely
this won't work if i.e. 'make geos-apple' is entered on a clean system. But still I consider
it appropriate.

I ordered the TARGETs btw so that they are more in an alphabetical order...
Search for "local" binaries only once.