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d_iwad: Make CheckDirectoryHasIWAD dir parameter const

--- a/src/d_iwad.c

+++ b/src/d_iwad.c

@@ -465,7 +465,7 @@

 // file, returning the full path to the IWAD if found, or NULL

 // if not found.

-static char *CheckDirectoryHasIWAD(char *dir, char *iwadname)

+static char *CheckDirectoryHasIWAD(const char *dir, char *iwadname)

 {

     char *filename; 

     char *probe;