1. move sgidefs.h to libc/arch-mips. See bionic 6e50cb454451916ced315680f6c13dc08cf3959a 2. change type of u_ar0 from "unsigned long" to "struct user_regs_struct*". See bionic e03950fa0c5567edf70d011b856a027e03b1c0f7 3. sync fts.h, dlext.h, sys/user.h 4. remove ' from string.h Change-Id: I2ba58b0df4c655f107ea086efbd0220de2b40e9a