GCC-4.7 fixes

* gcc 4.7 imposed #include changes

src/flarq-src/flarq.cxx

@@ -21,7 +21,7 @@
 // ----------------------------------------------------------------------------
 
 #include <config.h>
-
+#include <unistd.h>
 #include <stdlib.h>
 #include <iostream>
 #include <fstream>

src/logger/rx_extract.cxx

@@ -21,6 +21,7 @@
 
 #include <config.h>
 
+#include <unistd.h>
 #include <iostream>
 #include <fstream>
 #include <string>

src/wefax/wefax-pic.cxx

@@ -30,7 +30,9 @@
 #include <sstream>
 #include <iomanip>
 
+
 #include <time.h>
+#include <unistd.h>
 
 #include <FL/Fl_Widget.H>
 #include <FL/Fl_Button.H>

src/wefax/wefax.cxx

@@ -25,6 +25,7 @@
 
 #include <config.h>
 
+#include <unistd.h>
 #include <cstdlib>
 #include <sstream>
 #include <iostream>