Enable Python support for Windows host GDB about crosstool-ng-old HOT 2 CLOSED

NOTE: The GNU ARM Embedded GDB (arm-none-eabi-gdb-py.exe) depends on Python 2.7 (python27.dll).

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Since the GDB build process uses a Python script (python-config.py) to resolve the GDB configurations (i.e. include and lib paths and names), the host Python must be able to execute on the build system.

Note that we are currently building the Windows host GDB on the Linux build system and this is not possible (well, we could potentially use wine, but let's try to not go there ...).

In order to work around this, a special (hack) repository that contains the host libpython import library and the python-config.py emulator shell script was created:
https://github.com/stephanosio/mingw-w64-libpython

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