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config: Make M_GetFloatVariable parameter const

--- a/src/m_config.c

+++ b/src/m_config.c

@@ -2143,7 +2143,7 @@

     return *variable->location.s;

 }

-float M_GetFloatVariable(char *name)

+float M_GetFloatVariable(const char *name)

 {

     default_t *variable;

--- a/src/m_config.h

+++ b/src/m_config.h

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

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

 int M_GetIntVariable(char *name);

 const char *M_GetStringVariable(char *name);

-float M_GetFloatVariable(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);