replaced jpeg 9a by libjpeg-turbo 1.3.1.

download: http://sourceforge.net/projects/libjpeg-turbo/files/1.3.1/libjpeg-turbo-1.3.1.tar.gz/download
libjpeg-turbo now uses the multi-threaded DLL runtime library (/MD) instead of the multi-threaded static one (/MT).