- correct uid_t from i32 to u32 on linux - define uid_t and gid_t for OSes missing definitions - use uid_t/gid_t instead of plain u32s throughout std.os
- correct uid_t from i32 to u32 on linux - define uid_t and gid_t for OSes missing definitions - use uid_t/gid_t instead of plain u32s throughout std.os