Fix reading and writing format 13 cmap tables * language is a 32-bit field when reading * fix table length calculation when writing Patch from Devon Govett <[email protected]> BUG= Review URL: https://codereview.chromium.org/612653002/ git-svn-id: http://ots.googlecode.com/svn/trunk@117 a4e77c2c-9104-11de-800e-5b313e0d2bf3