Fixed data TCM & support pkg to load initial data.
Necessary to run on strict Harvard mode while building the core up...
Hacked data TCM to be mirrored all over the address map.
This way we can load it with the object code and read .rodata section.
Temp hack in core TB to get the hello demo working.
Also minor fixed in TB package.
Fixed main makefile to use gcc builtin functions.
Fixed hello program to work in the core TB.