Merge branch 'netdb' into 'master'

src/header/mod.rs

src/header/netdb/cbindgen.toml

src/header/netdb/dns/answer.rs

src/header/netdb/dns/mod.rs

src/header/netdb/dns/query.rs

src/header/netdb/linux.rs

src/header/netdb/mod.rs

src/header/netdb/redox.rs

src/header/netinet_in/mod.rs

src/header/pwd/mod.rs

src/header/stdio/printf.rs

src/header/strings/mod.rs

src/header/sys_socket/cbindgen.toml

src/header/sys_socket/mod.rs

src/header/time/constants.rs

src/platform/mod.rs

src/platform/rawfile.rs

src/platform/rlb.rs

src/platform/types.rs

tests/Makefile