Added patch from AC

- add missing includes "unistd.h" for compiling with gcc 4.7.0.

git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@5096 b45a01b8-16f6-495d-af2f-9b41ad6348cc

retroshare-gui/src/main.cpp

@@ -54,6 +54,7 @@
 #include <retroshare/rsinit.h>
 #include <retroshare/rsiface.h>
 #include "gui/notifyqt.h"
+#include <unistd.h>
 
 int main(int argc, char *argv[])
 {