[patch] Only configure libstdc++-v3/python dir for hosted builds

[Jonathan Wakely]

Currently a freestanding build installs the Python GDB hooks as
${libdir}/libstdc*-gdb.py (with a literal * character in the filename)
because there is no libstdc++.so library file and the wildcard doesn't
get expanded (see the install-data-local target in the
libstdc++-v3/python/Makefile.am file).

I don't see any reason to install any Python files for a freestanding
build, the pretty printers and type printers are only useful for types
defined in the hosted library, so this just disables the entire
directory.

Is there any reason not to do this?
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