net/wpa_gui: add <unistd.h> for modern compilers

Actually, this header was conditionally included for ming32, so
I only removed that condition so unistd.h is always included.

Approved by:	portmgr (bapt, implicit)

net/wpa_gui/files/patch-wpagui.cpp

@@ -0,0 +1,13 @@
+--- wpagui.cpp.orig	2010-09-07 15:43:39.000000000 +0000
++++ wpagui.cpp
+@@ -12,10 +12,7 @@
+  * See README and COPYING for more details.
+  */
+ 
+-#ifdef __MINGW32__
+-/* Need to get getopt() */
+ #include <unistd.h>
+-#endif
+ 
+ #ifdef CONFIG_NATIVE_WINDOWS
+ #include <windows.h>