Remove unnecessary 'stdio.h'; ref #4947

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

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

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

@@ -5,7 +5,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <stdio.h>
 #include <ctype.h>
 
 #include <mruby.h>

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

@@ -17,7 +17,6 @@
 
 #include <stdlib.h>
 #include <string.h>
-#include <stdio.h>
 #include <ctype.h>
 
 #include <signal.h>

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

-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <mruby.h>

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

-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <mruby.h>

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

-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <mruby.h>

mrbgems/mruby-io/src/file_test.c

@@ -28,7 +28,6 @@
 #include <fcntl.h>
 
 #include <errno.h>
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 

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)

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"

mrbgems/mruby-pack/src/pack.c

@@ -13,7 +13,6 @@
 #include <ctype.h>
 #include <errno.h>
 #include <limits.h>
-#include <stdio.h>
 #include <string.h>
 
 struct tmpl {

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)

mrbgems/mruby-socket/test/sockettest.c

-#include <stdio.h>
 #include <stdlib.h>
 
 #include "mruby.h"

mrbgems/mruby-sprintf/src/sprintf.c

@@ -7,7 +7,6 @@
 #include <mruby.h>
 
 #include <limits.h>
-#include <stdio.h>
 #include <string.h>
 #include <mruby/string.h>
 #include <mruby/hash.h>

mrbgems/mruby-time/src/time.c

@@ -14,9 +14,7 @@
 #include <mruby/numeric.h>
 #include <mruby/time.h>
 
-#ifndef MRB_DISABLE_STDIO
-#include <stdio.h>
-#else
+#ifdef MRB_DISABLE_STDIO
 #include <string.h>
 #endif