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Add format attribute to DEH_snprintf

--- a/src/deh_str.h

+++ b/src/deh_str.h

@@ -27,7 +27,7 @@

 char *DEH_String(char *s);

 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, ...);

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

 void DEH_AddStringReplacement(char *from_text, char *to_text);