eris: get rid of hooks for luai_writestring.

luprex/eris-master/src/luaconf.h

@@ -210,8 +210,9 @@
 ** avoids including 'stdio.h' everywhere.)
 */
 #if defined(LUA_LIB) || defined(lua_c)
-extern void luai_writestring(const char *s, size_t len);
-extern void luai_writeline();
+#include <stdio.h>
+#define luai_writestring(s,l)	fwrite((s), sizeof(char), (l), stdout)
+#define luai_writeline()	(luai_writestring("\n", 1), fflush(stdout))
 #endif
 
 /*
@@ -221,7 +222,6 @@ extern void luai_writeline();
 #define luai_writestringerror(s,p) \
 	(fprintf(stderr, (s), (p)), fflush(stderr))
 
-
 /*
 @@ LUAI_MAXSHORTLEN is the maximum length for short strings, that is,
 ** strings that are internalized. (Cannot be smaller than reserved words