[mythtv] backend from SVN 9761 bangs on mysqld

[Mark Weaver]

> We could also switch to another data structure as Janne suggests.
> A hash_map would probably save some space, at least on 64 bit
> systems. hash_map is not available on Microsoft Windows, but it
> has the same interface as a regular STL map, so an ifdef on the
> declaration could handle this in a WIN32 port.
> 
It is in MSVC, although in later versions it moved to the stdext 
namespace.  It may not have exactly the same interface though (there are 
a bunch of different vendor supplied hash_maps with different interfaces).