(don't worry about all the generated stubs, they're optimized away
by the linker)
-> side effect: no need anymore to use special declarations for
external C functions under Darwin compared to other platforms
(it's still necessary for variables though)
+ refaddr to treference added
+ refsymbol to treference added
* top_local stuff moved to an extra record to save memory
+ aint introduced
* tppufile.get/putint64/aint implemented
ideal, we should generate stubs in all files where the routines are
used -> these are automatically merged by the linker; now we generate
one global symbol with a jump to a stub in unit where the routine is
declared)
+ (not yet working) Darwin support for imported variables
+ Darwin support for linking
