Remove unnecessary 'stdio.h'; ref
'stdio.h' is included in 'mruby.h' ('mrbconf.h').
However, keep 'stdio.h' used by mruby-test.
MODIFY
mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c
mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c
#include <stdlib.h>
#include <string.h>
-#include <stdio.h>
#include <ctype.h>
#include <mruby.h>

MODIFY
mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
#include <stdlib.h>
#include <string.h>
-#include <stdio.h>
#include <ctype.h>
#include <signal.h>

MODIFY
mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
mrbgems/mruby-bin-mrbc/tools/mrbc/mrbc.c
-#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mruby.h>

MODIFY
mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
-#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mruby.h>

MODIFY
mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c
mrbgems/mruby-bin-strip/tools/mruby-strip/mruby-strip.c
-#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mruby.h>

MODIFY
mrbgems/mruby-io/src/file_test.c
mrbgems/mruby-io/src/file_test.c
#include <fcntl.h>
#include <errno.h>
-#include <stdio.h>
#include <stdlib.h>
#include <string.h>

MODIFY
mrbgems/mruby-io/src/io.c
mrbgems/mruby-io/src/io.c
@@ -55,7 +55,6 @@ typedef mrb_int pid_t;
#include <fcntl.h>
#include <errno.h>
-#include <stdio.h>
#include <string.h>
#define OPEN_ACCESS_MODE_FLAGS (O_RDONLY | O_WRONLY | O_RDWR)

MODIFY
mrbgems/mruby-io/test/mruby_io_test.c
mrbgems/mruby-io/test/mruby_io_test.c
@@ -56,7 +56,6 @@ mkdtemp(char *temp)
#endif
#include <sys/stat.h>
-#include <stdio.h>
#include <stdlib.h>
#include "mruby.h"

MODIFY
mrbgems/mruby-pack/src/pack.c
mrbgems/mruby-pack/src/pack.c
#include <ctype.h>
#include <errno.h>
#include <limits.h>
-#include <stdio.h>
#include <string.h>
struct tmpl {

MODIFY
mrbgems/mruby-print/src/print.c
mrbgems/mruby-print/src/print.c
#include <mruby.h>
#include <mruby/string.h>
-#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#if defined(_WIN32)

MODIFY
mrbgems/mruby-socket/test/sockettest.c
mrbgems/mruby-socket/test/sockettest.c
-#include <stdio.h>
#include <stdlib.h>
#include "mruby.h"

MODIFY
mrbgems/mruby-sprintf/src/sprintf.c
mrbgems/mruby-sprintf/src/sprintf.c
#include <mruby.h>
#include <limits.h>
-#include <stdio.h>
#include <string.h>
#include <mruby/string.h>
#include <mruby/hash.h>

MODIFY
mrbgems/mruby-time/src/time.c
mrbgems/mruby-time/src/time.c
#include <mruby/numeric.h>
#include <mruby/time.h>
-#ifndef MRB_DISABLE_STDIO
-#include <stdio.h>
-#else
+#ifdef MRB_DISABLE_STDIO
#include <string.h>
#endif

Remove unnecessary 'stdio.h'; ref #4947

'stdio.h' is included in 'mruby.h' ('mrbconf.h').

However, keep 'stdio.h' used by mruby-test.