It is only effective when compile with mips, although
development no longer has to check themselves
Change-Id: I7fb703170e1cc6bb2e6ea31109851a90a26eacb8
1. Sync bionic's, remove mips-specific one
2. Fix statfs.c to transfer the new f_flags too
3. Revise comment about --wrap=symbol
Change-Id: If68818e3dcb2a4056cd0b2e100fcfb8b2156c33a