Commit log message:
```
lang/python*: Install GDB debugging scripts
Users with a GDB that supports Python extensions [1] will automatically
load the extra debugging extensions when debugging programs that are linked
with libpythonX.Y.so.foo.
This enables extensions like 'py-bt' and 'py-frame' as described in
the Fedora Wiki Article: Easier Python Debugging [2], which can be
very useful for debugging Python program state from crashes in
C extensions, for example.
[1] PYTHON option enabled in devel/gdb
[2] https://fedoraproject.org/wiki/Features/EasierPythonDebugging
Reviewed_by: mat, koobs (Python)
Approved by: koobs (Python)
Differential_Revision: D10398
```