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doom: Make M_StringWidth parameter const

--- a/src/doom/m_menu.c

+++ b/src/doom/m_menu.c

@@ -215,7 +215,7 @@

 static void M_SetupNextMenu(menu_t *menudef);

 static void M_DrawThermo(int x,int y,int thermWidth,int thermDot);

 static void M_WriteText(int x, int y, const char *string);

-static int  M_StringWidth(char *string);

+static int  M_StringWidth(const char *string);

 static int  M_StringHeight(const char *string);

 static void M_StartMessage(const char *string, void *routine, boolean input);

 static void M_ClearMenus (void);

@@ -1229,7 +1229,7 @@

 //

 // Find string width from hu_font chars

 //

-int M_StringWidth(char* string)

+int M_StringWidth(const char *string)

 {

     size_t             i;

     int             w = 0;