MacOS X support

[Kon Lovett]

Hi,
The src/serversocket.cpp include of sys/types.h is in the CVS. However 
the use of GNU libtoolize for MacOS X in autogen.sh is not.

-----
diff autogen.sh autogen.sh.darwin
4c4,9
< libtoolize --force --automake
---
> case `uname` in
>       (Darwin)        LIBTOOLIZE=glibtoolize  ;;
>       (*)                    LIBTOOLIZE=libtoolize   ;;
> esac
>
> $LIBTOOLIZE --force --automake