Hi, vxl

I met a problem when trying to build vxl with mingw32 4.5 on Windows.
The compiler reports that the "_tempnam" function is not declared in core/vul/vul_temp_filename.cxx.(I lost the exact error messages).

I added  #include <stdio.h> at LINE 16 of vul_temp_filename.cxx as

#if defined(VCL_VC) || defined(VCL_BORLAND) || defined(__MINGW32__)
  #include <Windows.h>
  #include <stdio.h>
#if defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)

It seems work well after that. All tests have been passed.

Don't know it is a bug or something else. But I wish this report may help.

Jason LIU