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d_iwad: Make SearchDirectoryForIWAD dir parameter const

--- a/src/d_iwad.c

+++ b/src/d_iwad.c

@@ -504,7 +504,7 @@

 // Search a directory to try to find an IWAD

 // Returns the location of the IWAD if found, otherwise NULL.

-static char *SearchDirectoryForIWAD(char *dir, int mask, GameMission_t *mission)

+static char *SearchDirectoryForIWAD(const char *dir, int mask, GameMission_t *mission)

 {

     char *filename;

     size_t i;