[rbp/omxplayer] Fix build error in types for max

It seems there is a compile error when STDINT_H_AVAILABLE is not defined.
See: http://raspbmc.apt-get.eu/downloads/bin/xbmc/nightlies/xbmc-rbp-20130710.log
Merge pull request #3067 from popcornmix/fix_compile_max

[rbp/omxplayer] Fix build error in types for max