Commit 3
Introduced 64-bit MinGW

64-bit DLL was successfully generated.
clean target in Makefile
make all, make run

If java is called in make, it looks like that 32-bit version of Java is called.
Fix of target run

It looks like that make command calls C:/Windows/System32/java.exe, and that this java.exe becomes 32-bit version only if called by make.