Changed hash[5] type from u_int32_t to uint32_t

Using uint32_t will make this part of code useable in a Windows
environment as it is a part of C99 standard and available with VS2010,
whereas u_int32_t is not available on Windows platorms.
Merge pull request #78 from namikk/master

Changed hash[5] type from u_int32_t to uint32_t to resolve compilation problems on Windows.