Merge pull request #7 from stassats/master

A typo in %mOKstemp -> %mKOstemp.
Pass flags to %MKOSTEMP
Add RECEIVE-FROM for raw sockets

Thanks to Christopher Laux
Modify the ping example to wait for the reply
Avoid loading libfixposix twice.
If a library is already loaded CFFI tries to unload it, which is not
implemented on ECL, causing errors during compilation.