Build failures with upcoming gcc-4.3 due to missing headers

In the upcoming gcc-4.3, libstdc++ header dependencies have been streamlined, reducing unnecessary includes and pre-processed bloat. The STL headers have been cleaned up, so that the headers don't drag in unnecessary dependencies which aren't requested by the standard. This causes error when compiling sword-1.5.10 with gcc-4.3, the attached patch incorporates the missing headers.