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wad: Make OpenFile parameter const

--- a/src/w_file.h

+++ b/src/w_file.h

@@ -28,7 +28,7 @@

 typedef struct

 {

     // Open a file for reading.

-    wad_file_t *(*OpenFile)(char *path);

+    wad_file_t *(*OpenFile)(const char *path);

     // Close the specified file.

     void (*CloseFile)(wad_file_t *file);

--- a/src/w_file_posix.c

+++ b/src/w_file_posix.c

@@ -74,7 +74,7 @@

     return lseek(handle, 0, SEEK_END);

 }

-static wad_file_t *W_POSIX_OpenFile(char *path)

+static wad_file_t *W_POSIX_OpenFile(const char *path)

 {

     posix_wad_file_t *result;

     int handle;

--- a/src/w_file_stdc.c

+++ b/src/w_file_stdc.c

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

 extern wad_file_class_t stdc_wad_file;

-static wad_file_t *W_StdC_OpenFile(char *path)

+static wad_file_t *W_StdC_OpenFile(const char *path)

 {

     stdc_wad_file_t *result;

     FILE *fstream;

--- a/src/w_file_win32.c

+++ b/src/w_file_win32.c

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

     return result;

 }

-static wad_file_t *W_Win32_OpenFile(char *path)

+static wad_file_t *W_Win32_OpenFile(const char *path)

 {

     win32_wad_file_t *result;

     wchar_t wpath[MAX_PATH + 1];