Error 2052: Unexpected data between symbol table and string

I have fat binaries created with Xcode 5.1 for armv7 and armv7s (iOS 7.1).
After extracting object files with `lipo` and `ar`, if I try to use objconv on them I always get this error.

```
$objconv old.o new.o
Input file: old.o, output file: new.o
Error 2052: Unexpected data between symbol table and string tableModifying Mach-O Little Endian32 file
```
