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Add GCC printf format string attribute

--- a/src/doomtype.h

+++ b/src/doomtype.h

@@ -66,10 +66,12 @@

 #endif

 #define PRINTF_ATTR(fmt, first) __attribute__((format(printf, fmt, first)))

+#define PRINTF_ARG_ATTR(x) __attribute__((format_arg(x)))

 #else

 #define PACKEDATTR

 #define PRINTF_ATTR(fmt, first)

+#define PRINTF_ARG_ATTR(x)

 #endif

 #ifdef __WATCOMC__