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textscreen: Add extern "C" for C++ imports.

This fixes #941. Thanks to @Altazimuth for the suggestion.

--- a/textscreen/textscreen.h

+++ b/textscreen/textscreen.h

@@ -15,6 +15,10 @@

 #ifndef TEXTSCREEN_H

 #define TEXTSCREEN_H

+#ifdef __cplusplus

+extern "C" {

+#endif

+

 #include "../src/doomkeys.h"

 #include "txt_main.h"

@@ -35,6 +39,10 @@

 #include "txt_widget.h"

 #include "txt_window_action.h"

 #include "txt_window.h"

+

+#ifdef __cplusplus

+}

+#endif

 #endif /* #ifndef TEXTSCREEN_H */