Also find CFI in sections of type SHT_X86_64_UNWIND

On my system with g++ (GCC) 8.2.1 20180831 with GNU gold (GNU Binutils
2.31.1) 1.16, the .eh_frame section does not have type PROGBITS
but rather is using X86_64_UNWIND nowadays:

```
$ echo "int main(){ return 0; }" > test.c
$ gcc test.c
$ readelf --sections a.out | grep .eh_frame
  [14] .eh_frame         X86_64_UNWIND    0000000000000670  00000670
  [15] .eh_frame_hdr     X86_64_UNWIND    0000000000000724  00000724
```

Without this patch, libdw refuses to use the available unwind
information, leading to broken backtraces while unwinding. With the
patch applied, unwinding works once more in such situations.

Signed-off-by: Milian Wolff <[email protected]>
Signed-off-by: Mark Wielaard <[email protected]>
Tested-by: Milian Wolff <[email protected]>

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