add missing F_GETOWNER_UIDS flag to bits/fcntl.h
fcntl.h: O_SEARCH was missing for powerpc put some macros that do not differ between architectures in the main header and remove from bits. restructure mips header so it has the same structure as the others.
microblaze port based on initial work by rdp, with heavy modifications. some features including threads are untested because qemu app-level emulation seems to be broken and I do not have a proper system image for testing.