Enable readline in Python in a GDB-specific way and block the

	Enable readline in Python in a GDB-specific way and block the
	standard Python readline module to prevent conflicts with GDB.
	* Makefile.in (SUBDIR_PYTHON_OBS): Add py-gdb-readline.o.
	(SUBDIR_PYTHON_SRCS): Add python/py-gdb-readline.c.
	(py-gdb-readline.o): Add rule to compile python/py-gdb-readline.c.
	* python/py-gdb-readline.c: New file.
	* python/python-internal.h (gdbpy_initialize_gdb_readline): New
	prototype.
	* python/python.c (_initialize_python): Call
	gdbpy_initialize_gdb_readline.