Include stdio.h in mrbconf.h instead of C extension sources.

include/mrbconf.h

@@ -110,4 +110,8 @@ typedef short mrb_sym;
 # include <inttypes.h>
 #endif
 
+#ifdef ENABLE_STDIO
+# include <stdio.h>
+#endif
+
 #endif  /* MRUBYCONF_H */

src/class.c

@@ -6,7 +6,6 @@
 
 #include "mruby.h"
 #include <stdarg.h>
-#include <stdio.h>
 #include <ctype.h>
 #include "mruby/class.h"
 #include "mruby/proc.h"

src/error.c

@@ -6,7 +6,6 @@
 
 #include "mruby.h"
 #include <stdarg.h>
-#include <stdio.h>
 #include <setjmp.h>
 #include <string.h>
 #include "error.h"

src/numeric.c

@@ -10,7 +10,6 @@
 #include "mruby/array.h"
 
 #include <math.h>
-#include <stdio.h>
 #include <assert.h>
 
 #if defined(__FreeBSD__) && __FreeBSD__ < 4

src/object.c

@@ -7,7 +7,6 @@
 #include "mruby.h"
 #include <string.h>
 #include "mruby/string.h"
-#include <stdio.h>
 #include "mruby/class.h"
 #include "mruby/numeric.h"
 #include "error.h"

src/parse.y

@@ -22,7 +22,6 @@
 #include "mruby/proc.h"
 #include "node.h"
 
-#include <stdio.h>
 #include <errno.h>
 #include <ctype.h>
 #include <string.h>

src/print.c

@@ -7,7 +7,6 @@
 #include "mruby.h"
 #ifdef ENABLE_STDIO
 #include "mruby/string.h"
-#include <stdio.h>
 
 static void
 printstr(mrb_state *mrb, mrb_value obj)

src/string.c

@@ -15,7 +15,6 @@
 #include "mruby/array.h"
 #include "mruby/class.h"
 #include "mruby/numeric.h"
-#include <stdio.h>
 #include "re.h"
 
 const char mrb_digitmap[] = "0123456789abcdefghijklmnopqrstuvwxyz";

src/vm.c

@@ -17,7 +17,6 @@
 #include "mruby/numeric.h"
 #include "error.h"
 
-#include <stdio.h>
 #include <string.h>
 #include <setjmp.h>
 #include <stddef.h>