Added missing include stdint.h to work with gcc 4.8.1

Without this include, this was not possible to build with gcc 4.8.1:

Build log (without this commit): http://kojipkgs.fedoraproject.org//work/tasks/1370/5521370/build.log
Merge pull request #413 from hroncok/patch-2

Added missing include stdint.h to work with gcc 4.8.1