Loosely based on Matthias Klose's earlier patch
<http://patchwork.ozlabs.org/patch/287368/>.

This time with his name spelled correctly; sorry about that!

Tested with:

$ make check-target-libstdc++-v3 RUNTESTFLAGS='--directory libstdc++-prettyprinters'

libstdc++-v3/

	PR libstdc++/58962
	* python/libstdcxx/v6/printers.py: Port to Python 2+3
	  (imap): New compat function.
	  (izip): Likewise.
	  (Iterator): New mixin to allow writing iterators in Python 3 style
	  regardless of which version we're running on.
	  [Python3] (long) New compat alias for "int".
	* testsuite/lib/gdb-test.exp: Port to Python 2+3 (print syntax)

Signed-off-by: Matthias Klose <doko@ubuntu.com>
Signed-off-by: Samuel Bronson <naesten@gmail.com>
---
 libstdc++-v3/python/libstdcxx/v6/printers.py | 110 +++++++++++++++++++--------
 libstdc++-v3/testsuite/lib/gdb-test.exp      |   4 +-
 2 files changed, 79 insertions(+), 35 deletions(-)