Review Request 109422: Fix mingw64 compiler errors

[Artur Bać]

Some time ago I also ported and fixed build of mingw64, i also added
initial gdb support on win32/64, changes were not merged into repository
for some reasons.
But dear kdevelop programers keep in mind that _long_ on x64 linux is 8
byte wide but on x64 windows is 4 byte wide.
Instead of using casts <long>( some pointer) use
intptr_t or uintptr_t , thise 2 types are portable.