Added missing header for uint32_t.
Added missing header for uint32_t.

This seemed to work on some platforms, but when compiling with MSVC the
compiler could not find the definition of uint32_t. Adding the proper
header fixes this.

Tested on Linux and Windows.

Change-Id: Ia58ac60c0b886fbbc24b07d40f5bb96193f93706

google/corgi,google/corgi