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Add format string attribute to M_snprintf

--- a/src/m_misc.h

+++ b/src/m_misc.h

@@ -46,7 +46,7 @@

 boolean M_StringStartsWith(const char *s, const char *prefix);

 boolean M_StringEndsWith(const char *s, const char *suffix);

 int M_vsnprintf(char *buf, size_t buf_len, const char *s, va_list args);

-int M_snprintf(char *buf, size_t buf_len, const char *s, ...);

+int M_snprintf(char *buf, size_t buf_len, const char *s, ...) PRINTF_ATTR(3, 4);

 char *M_OEMToUTF8(const char *ansi);

 #endif