Add GDB support adding xtensa-lx106-elf-gdb binary

[robotiko]

Hi,
It would be great if the xtensa-lx106-elf-gdb binary could be added to take advantage of the the GDB debugger in windows.
https://github.com/espressif/esp-gdbstub

Thanks

[valkuc]

@cherts , any news on gdbstub support for UDK?