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Make M_FileCaseExists parameter const

--- a/src/m_misc.c

+++ b/src/m_misc.c

@@ -86,7 +86,7 @@

 // Check if a file exists by probing for common case variation of its filename.

 // Returns a newly allocated string that the caller is responsible for freeing.

-char *M_FileCaseExists(char *path)

+char *M_FileCaseExists(const char *path)

 {

     char *path_dup, *filename, *ext;

--- a/src/m_misc.h

+++ b/src/m_misc.h

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

 void M_MakeDirectory(const char *dir);

 char *M_TempFile(const char *s);

 boolean M_FileExists(const char *file);

-char *M_FileCaseExists(char *file);

+char *M_FileCaseExists(const char *file);

 long M_FileLength(FILE *handle);

 boolean M_StrToInt(const char *str, int *result);

 void M_ExtractFileBase(char *path, char *dest);