msvc2005: added code to build_xxx.bat scripts to create build directory if necessary.

git-svn-id: svn://dev.exiv2.org/svn@3152 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3
msvc2005: changes for Visual Studio 2012.

git-svn-id: svn://dev.exiv2.org/svn@3153 b7c8b350-86e7-0310-a4b4-de8f6a8f16a3