import https://mattmccutchen.net/bigint/

git-svn-id: https://zxing.googlecode.com/svn/trunk@2662 59b500cc-1b3d-0410-9834-0bbf25fbcc57
compile .cc as well .cpp files to include bigint

git-svn-id: https://zxing.googlecode.com/svn/trunk@2663 59b500cc-1b3d-0410-9834-0bbf25fbcc57
pdf417 patch sans vs tweaks

git-svn-id: https://zxing.googlecode.com/svn/trunk@2664 59b500cc-1b3d-0410-9834-0bbf25fbcc57
c++ port of r2660

git-svn-id: https://zxing.googlecode.com/svn/trunk@2665 59b500cc-1b3d-0410-9834-0bbf25fbcc57