Investigate symbol mangling for longer symbols

[promovicz]

As previously discussed elsewhere:

I investigated the possibility of adding a symbol mangler and mapper so that longer symbols can be used... it's definitely possible but I didn't actually do it. Further magic would be required to link, run and maybe debug the code on the mainframe side. But it should allow compiling things like... sqlite as a DB/2 replacement. Or even wilder things.

Originally posted by @promovicz in #1 (comment)