Add configuration guard for `MRB_DISABLE_STDIO`

ref #4576 and ref #4947

* Need MRBAPI functions without `MRB_DISABLE_STDIO`:
  * mrbgems/mruby-bin-debugger
  * mrbgems/mruby-bin-mirb
  * mrbgems/mruby-bin-mrbc
  * mrbgems/mruby-bin-mruby
  * mrbgems/mruby-bin-strip
* Need `stdio.h`:
  * mrbgems/mruby-io
  * mrbgems/mruby-print
* Need `snprintf()` in `stdio.h`:
  * mrbgems/mruby-pack
  * mrbgems/mruby-sprintf

mrbgems/mruby-bin-debugger/tools/mrdb/mrdbconf.h

@@ -10,6 +10,10 @@
 # error mruby-bin-debugger need 'MRB_ENABLE_DEBUG_HOOK' configuration in your 'build_config.rb'
 #endif
 
+#ifdef MRB_DISABLE_STDIO
+# error mruby-bin-debugger conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 /* configuration options: */
 /* maximum size for command buffer */
 #define MAX_COMMAND_LINE 1024

mrbgems/mruby-bin-mirb/tools/mirb/mirb.c

@@ -7,6 +7,11 @@
 */
 
 #include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error mruby-bin-mirb conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include <mruby/array.h>
 #include <mruby/proc.h>
 #include <mruby/compile.h>

mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c

+#include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error mruby-bin-mrbc conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include <stdlib.h>
 #include <string.h>
-#include <mruby.h>
 #include <mruby/compile.h>
 #include <mruby/dump.h>
 #include <mruby/proc.h>

mrbgems/mruby-bin-mruby/tools/mruby/mruby.c

+#include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error mruby-bin-mruby conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include <stdlib.h>
 #include <string.h>
-#include <mruby.h>
 #include <mruby/array.h>
 #include <mruby/compile.h>
 #include <mruby/dump.h>

mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c

+#include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error mruby-bin-strip conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include <stdlib.h>
 #include <string.h>
-#include <mruby.h>
 #include <mruby/irep.h>
 #include <mruby/dump.h>
 

mrbgems/mruby-io/include/mruby/ext/io.h

@@ -5,6 +5,12 @@
 #ifndef MRUBY_IO_H
 #define MRUBY_IO_H
 
+#include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error IO and File conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #if defined(__cplusplus)
 extern "C" {
 #endif

mrbgems/mruby-pack/src/pack.c

@@ -2,7 +2,12 @@
  ** pack.c - Array#pack, String#unpack
  */
 
-#include "mruby.h"
+#include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error pack/unpack conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include "mruby/error.h"
 #include "mruby/array.h"
 #include "mruby/class.h"

mrbgems/mruby-print/src/print.c

 #include <mruby.h>
+
+#ifdef MRB_DISABLE_STDIO
+# error print conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include <mruby/string.h>
 #include <string.h>
 #include <stdlib.h>

mrbgems/mruby-sprintf/src/sprintf.c

@@ -6,6 +6,10 @@
 
 #include <mruby.h>
 
+#ifdef MRB_DISABLE_STDIO
+# error sprintf conflicts 'MRB_DISABLE_STDIO' configuration in your 'build_config.rb'
+#endif
+
 #include <limits.h>
 #include <string.h>
 #include <mruby/string.h>