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dehacked: Make NextFormatArgument and ValidFormatReplacement parameters const

--- a/src/deh_str.c

+++ b/src/deh_str.c

@@ -251,7 +251,7 @@

 // Given the specified string, get the type of the first format

 // string encountered.

-static format_arg_t NextFormatArgument(char **str)

+static format_arg_t NextFormatArgument(const char **str)

 {

     format_arg_t argtype;

@@ -326,10 +326,10 @@

 // Return true if the specified string contains no format arguments.

-static boolean ValidFormatReplacement(char *original, char *replacement)

+static boolean ValidFormatReplacement(const char *original, const char *replacement)

 {

-    char *rover1;

-    char *rover2;

+    const char *rover1;

+    const char *rover2;

     int argtype1, argtype2;

     // Check each argument in turn and compare types.