Declare is_portable only once in frame.c and not in each backend.

src/backends/unix/main.c

@@ -32,8 +32,6 @@
 
 void registerHandler(void);
 
-qboolean is_portable;
-
 int
 main(int argc, char **argv)
 {

src/backends/windows/main.c

@@ -31,8 +31,6 @@
 
 #include "../../common/header/common.h"
 
-qboolean is_portable;
-
 /*
  * Windows main function. Containts the
  * initialization code and the main loop

src/backends/windows/system.c

@@ -48,9 +48,6 @@ static HINSTANCE game_library;
 static char console_text[256];
 static size_t console_textlen;
 
-// TODO
-qboolean is_portable;
-
 /* ================================================================ */
 
 void

src/common/frame.c

@@ -69,6 +69,9 @@ void Key_Init(void);
 void SCR_EndLoadingPlaque(void);
 #endif
 
+// Is the game portable?
+qboolean is_portable;
+
 // ----
 
 static void