include strstream instead of strstream.h

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

[...]

| Something like:
| 
| This file includes at least one deprecated or antiquated C++ header. \
| Please consider using one of the 32 headers found in section 17.4.1.2 
| of the C++ standard: this may include substituting the <X> header instead of 
| <X.h> header for C++ includes, or using <sstream> instead of 
| <strstream.h>. To disable this warning use -Wno-deprecated
| 
| Might be more accurate.


Thanks for clarifying.  Nominating C headers is a bit confusing -- at
least, that led Joe to think that <math.h> was affected, and myself
was fooled.

-- Gaby