add the _XOPEN_SOURCE define, which was ommitted from before, this is used to define certain POSIX/XPG APIs/structures
add the _XOPEN_SOURCE define, which was ommitted from before, this is
used to define certain POSIX/XPG APIs/structures

svn path=/trunk/libshout/; revision=4487

mwgoldsmith/shout,mwgoldsmith/shout