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heretic: Make MN_TextBWidth parameter const

--- a/src/heretic/doomdef.h

+++ b/src/heretic/doomdef.h

@@ -821,7 +821,7 @@

 void MN_DrTextA(const char *text, int x, int y);

 int MN_TextAWidth(const char *text);

 void MN_DrTextB(const char *text, int x, int y);

-int MN_TextBWidth(char *text);

+int MN_TextBWidth(const char *text);

 #include "sounds.h"

--- a/src/heretic/mn_menu.c

+++ b/src/heretic/mn_menu.c

@@ -416,7 +416,7 @@

 //

 //---------------------------------------------------------------------------

-int MN_TextBWidth(char *text)

+int MN_TextBWidth(const char *text)

 {

     char c;

     int width;