[MIPS] Handle CFLAGS with -funwind-tables.

[Tom de Vries]

Hi,

when doing a MIPS build with CFLAGS -g -O2 -funwind-tables, we run into the
following errors:
...
/tmp/ccNETuvb.s: Assembler messages:
ccNETuvb.s: Error: open CFI at the end of file; missing .cfi_endproc directive
ccNETuvb.s: Error: open CFI at the end of file; missing .cfi_endproc directive
make[2]: *** [default/csu/crti.o] Error 1
default/csu/crtn.S: Assembler messages:
crtn.S:33: Error: CFI instruction used without previous .cfi_startproc
crtn.S:34: Error: CFI instruction used without previous .cfi_startproc
crtn.S:35: Error: .cfi_endproc without corresponding .cfi_startproc
crtn.S:56: Error: CFI instruction used without previous .cfi_startproc
crtn.S:57: Error: CFI instruction used without previous .cfi_startproc
crtn.S:58: Error: .cfi_endproc without corresponding .cfi_startproc
make[2]: *** [default/csu/crtn.o] Error 1
...

With attached patch, we manage to complete the build.

The fix is also present in glibc-ports/sysdeps/arm/eabi/Makefile.

I tested the patch on MIPS qemu (mips-linux-gnu) with host i686-pc-linux-gnu.

Thanks,
- Tom
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