mips: sync header with glibc
mips: sync header with glibc

Fixes following compile error, when UCLIBC_HAS_CONTEXT_FUNCS is enabled
on a mips64 build:

  CC libc/sysdeps/linux/common/_exit.os
libc/sysdeps/linux/mips/swapcontext.S: Assembler messages:
libc/sysdeps/linux/mips/swapcontext.S:110: Error: Illegal operands `s.d fs6,(30*8+296)($4)'
libc/sysdeps/linux/mips/swapcontext.S:111: Error: Illegal operands `s.d fs7,(31*8+296)($4)'
libc/sysdeps/linux/mips/swapcontext.S:149: Error: Illegal operands `l.d fs6,(30*8+296)($2)'
libc/sysdeps/linux/mips/swapcontext.S:150: Error: Illegal operands `l.d fs7,(31*8+296)($2)'

Reported-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@free-electrons.com>

kraj/uclibc-ng,wbx-github/uclibc-ng,kraj/uclibc-ng,wbx-github/uclibc-ng,wbx-github/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng,brgl/uclibc-ng,brgl/uclibc-ng,wbx-github/uclibc-ng,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,brgl/uclibc-ng,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uclibc-ng