Enable valgrind support by default in Red Hat / Fedora package

[Jason Evans]

On Jun 14, 2013, at 1:05 AM, Ingvar Hagelund wrote:
> I got a request for enabling valgrind support by default in the RedHat/Fedora package, ie. add valgrind-devel to the build requirements. (bz#974270)
> 
> Is there any downside with just adding valgrind support to the RedHat/Fedora build?
> 
> How will jemalloc behave if valgrind support is compiled in, but valgrind is not installed at runtime?

The only down side is that a few extra instructions (no-op sequences) are executed per allocation event.  As long as the valgrind dependency doesn't cause any rpm build-time dependency issues, I'd say go for it.

Jason