change ghost/x11 toggleConsole to use dummy function in the header.

intern/ghost/intern/GHOST_SystemX11.cpp

@@ -1490,11 +1490,3 @@ void GHOST_SystemX11::putClipboard(GHOST_TInt8 *buffer, bool selection) const
 			fprintf(stderr, "failed to own primary\n");
 	}
 }
-
-
-int GHOST_SystemX11::toggleConsole(int action)
-{
-	/* do nothing */
-	(void)action;
-	return 0;
-}

intern/ghost/intern/GHOST_SystemX11.h

@@ -227,7 +227,10 @@ public:
 	 */
 	void putClipboard(GHOST_TInt8 *buffer, bool selection) const;
 
-	int toggleConsole(int action); /* dummy */
+	/**
+	 * @see GHOST_ISystem
+	 */
+	int toggleConsole(int action) { return 0; }
 
 	/**
 	 * Atom used for ICCCM, WM-spec and Motif.