Macho-extractor: support extraction of any object from fat Mach-O

[PeterMatula]

The original tool was created to extract archives from fat Mach-O archives. But it would be useful, if it could extract any object from fat Mach-O. E.g. binary, that is not an archive.

Maybe, this is all that needs to be done:

---    valid = isStaticLibrary();
+++    valid = true; //isStaticLibrary();

But it needs to be checked before using it in master.

[mbandzi]

fixed in master