Possible fix for hash_set in windows

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@896 d0cd1f9f-072b-0410-8dd7-cf729c803f20
fix VC++ build

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@898 d0cd1f9f-072b-0410-8dd7-cf729c803f20
add VS2010 solution and update VS2008 solution

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@899 d0cd1f9f-072b-0410-8dd7-cf729c803f20
fix gcc& clang build (addition to r898)

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@900 d0cd1f9f-072b-0410-8dd7-cf729c803f20