Make long 32-bits on 32-bit systems

src/header/netdb/mod.rs

src/header/stdio/lookaheadreader.rs

src/header/stdlib/mod.rs

src/header/sys_select/mod.rs

src/header/sys_time/mod.rs

src/header/time/mod.rs

src/header/unistd/mod.rs

src/platform/pte.rs

src/platform/redox/mod.rs

src/platform/redox/signal.rs

src/platform/redox/socket.rs

src/platform/rlb.rs

src/platform/types.rs