Fixes the Cygwin build

ChangeLog

@@ -1,3 +1,6 @@
+2019-08-07  Markus Gans  <guru.mail@muenster.de>
+	* Fixes the Cygwin build
+
 2019-08-04  Markus Gans  <guru.mail@muenster.de>
 	* Reduce the number of interface parameters
 

src/ftermdetection.cpp

@@ -20,6 +20,10 @@
 * <http://www.gnu.org/licenses/>.                                      *
 ***********************************************************************/
 
+#if defined(__CYGWIN__)
+  #include "final/fconfig.h"  // includes _GNU_SOURCE for fd_set
+#endif
+
 #include "final/emptyfstring.h"
 #include "final/fc.h"
 #include "final/fconfig.h"

src/ftermxterminal.cpp

@@ -20,6 +20,10 @@
 * <http://www.gnu.org/licenses/>.                                      *
 ***********************************************************************/
 
+#if defined(__CYGWIN__)
+  #include "final/fconfig.h"  // includes _GNU_SOURCE for fd_set
+#endif
+
 #include "final/fc.h"
 #include "final/fstring.h"
 #include "final/fterm.h"

src/ftextview.cpp

@@ -20,6 +20,11 @@
 * <http://www.gnu.org/licenses/>.                                      *
 ***********************************************************************/
 
+#if defined(__CYGWIN__)
+  #include "final/fconfig.h"  // includes _GNU_SOURCE for wcwidth()
+#endif
+
+#include <wchar.h>
 #include <memory>
 
 #include "final/fapplication.h"

src/include/final/fvterm.h

@@ -48,10 +48,6 @@
   #error "Only <final/final.h> can be included directly."
 #endif
 
-#if defined(__CYGWIN__)
-  #include "final/fconfig.h"  // includes _GNU_SOURCE for wcwidth()
-#endif
-
 #include <queue>
 #include <sstream>  // std::stringstream
 #include <string>