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Add format string attribute to DEH_String

--- a/src/deh_str.h

+++ b/src/deh_str.h

@@ -24,7 +24,7 @@

 // Used to do dehacked text substitutions throughout the program

-char *DEH_String(char *s);

+char *DEH_String(char *s) PRINTF_ARG_ATTR(1);

 void DEH_printf(char *fmt, ...) PRINTF_ATTR(1, 2);

 void DEH_fprintf(FILE *fstream, char *fmt, ...) PRINTF_ATTR(2, 3);

 void DEH_snprintf(char *buffer, size_t len, char *fmt, ...) PRINTF_ATTR(3, 4);