[Lazarus] GDB on Win32 and Win64 (feature request)

[Martok]

> Am I missing something, or would it be an idea to add the debugger location into
> the target dependent options ?
You can use target/platform macros there. The default for the directory
structure from the installer should be:

$(LazarusDir)\mingw\bin\$(TargetCPU)-$(TargetOS)\gdb.exe