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config: Make M_GetStringVariable parameter const

--- a/src/m_config.c

+++ b/src/m_config.c

@@ -2128,7 +2128,7 @@

     return *variable->location.i;

 }

-const char *M_GetStringVariable(char *name)

+const char *M_GetStringVariable(const char *name)

 {

     default_t *variable;

--- a/src/m_config.h

+++ b/src/m_config.h

@@ -31,7 +31,7 @@

 void M_BindStringVariable(char *name, char **variable);

 boolean M_SetVariable(char *name, char *value);

 int M_GetIntVariable(char *name);

-const char *M_GetStringVariable(char *name);

+const char *M_GetStringVariable(const char *name);

 float M_GetFloatVariable(const char *name);

 void M_SetConfigFilenames(const char *main_config, const char *extra_config);

 char *M_GetSaveGameDir(const char *iwadname);