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config: Make M_GetIntVariable parameter const

--- a/src/m_config.c

+++ b/src/m_config.c

@@ -2113,7 +2113,7 @@

 // Get the value of a variable.

-int M_GetIntVariable(char *name)

+int M_GetIntVariable(const char *name)

 {

     default_t *variable;

--- a/src/m_config.h

+++ b/src/m_config.h

@@ -30,7 +30,7 @@

 void M_BindFloatVariable(char *name, float *variable);

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

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

-int M_GetIntVariable(char *name);

+int M_GetIntVariable(const 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);