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i_system: mark I_Quit() and I_Error() with GCC's 'noreturn' attribute

Thanks @turol for the tip.

--- a/src/doomtype.h

+++ b/src/doomtype.h

@@ -67,11 +67,13 @@

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

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

+#define NORETURN __attribute__((noreturn))

 #else

 #define PACKEDATTR

 #define PRINTF_ATTR(fmt, first)

 #define PRINTF_ARG_ATTR(x)

+#define NORETURN

 #endif

 #ifdef __WATCOMC__

--- a/src/i_system.h

+++ b/src/i_system.h

@@ -50,9 +50,9 @@

 // Called by M_Responder when quit is selected.

 // Clean exit, displays sell blurb.

-void I_Quit (void);

+void I_Quit (void) NORETURN;

-void I_Error (const char *error, ...) PRINTF_ATTR(1, 2);

+void I_Error (const char *error, ...) NORETURN PRINTF_ATTR(1, 2);

 void I_Tactile (int on, int off, int total);