[with spkg, positive review] upgrade optinal valgrind.spkg to the 3.3.1 release

[rlm]

[12:50pm] rlm: __Pyx_ImportType?
[12:51pm] rlm: sound familiar? i'm valgrinding, and this
seems to be many of 13,030 loss records...
[12:51pm] mabshoff: Yes.
[12:51pm] mabshoff: It is Cython dictionaries and I plan
to suppress them in the future.
...
[12:52pm] mabshoff: Can you make a ticket for it? I also
want to upgrade the optional valgrind.spkg to 3.3.1 and
also change some of the default options, i.e. no more
--follow-children
...
[1:06pm] mabshoff: Re #3675: I can do some env option
that would build python specifically for valgrind/debugging.

[mabshoff]

The updated spkg is at

 http://sage.math.washington.edu/home/mabshoff/release-cycles-3.1.2/rc4/valgrind_3.3.1.spkg

Cheers,

Michael

[rlm]

Suppression good!

[mabshoff]

Merged in the optional spkg repo in Sage 3.1.2.rc4.