Fix to compile and run on DMD v.2.061.1

Also turns out DMDScript was agressively non-64 bit.
I've fixed a number of tivial intergal size issues but stopped
at IR generator converting pointer to uint. It may happen that size_t will just work,
will look into it later.
Merge pull request #1 from DmitryOlshansky/compile-on-2.061.1

Fix to compile and run on DMD v.2.061.1