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Make I_SetWindowTitleHR parameter const

--- a/src/i_videohr.c

+++ b/src/i_videohr.c

@@ -32,7 +32,7 @@

 static SDL_Window *hr_screen = NULL;

 static SDL_Surface *hr_surface = NULL;

-static char *window_title = "";

+static const char *window_title = "";

 boolean I_SetVideoModeHR(void)

 {

@@ -64,7 +64,7 @@

     return true;

 }

-void I_SetWindowTitleHR(char *title)

+void I_SetWindowTitleHR(const char *title)

 {

     window_title = title;

 }

--- a/src/i_videohr.h

+++ b/src/i_videohr.h

@@ -21,7 +21,7 @@

 boolean I_SetVideoModeHR(void);

 void I_UnsetVideoModeHR(void);

-void I_SetWindowTitleHR(char *title);

+void I_SetWindowTitleHR(const char *title);

 void I_ClearScreenHR(void);

 void I_SlamBlockHR(int x, int y, int w, int h, const byte *src);

 void I_SlamHR(const byte *buffer);