remove superfluous includes

- reduce compile time by a little bit (full-core: ~0.7s for me)
- thanks to 'include-what-you-use' for some help
- include Standard C header files before any other (coding style)

7 files changed, 10 insertions, 22 deletions

diff --git a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
index 81eef7f82..5505e8e5e 100644
--- a/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
+++ b/mrbgems/mruby-bin-mirb/tools/mirb/mirb.c
@@ -8,21 +8,17 @@
 
 #include <stdlib.h>
 #include <string.h>
-
-#include <mruby.h>
+#include "mruby.h"
 #include "mruby/array.h"
-#include <mruby/proc.h>
-#include <mruby/data.h>
-#include <mruby/compile.h>
+#include "mruby/proc.h"
+#include "mruby/compile.h"
+#include "mruby/string.h"
+
 #ifdef ENABLE_READLINE
 #include <limits.h>
 #include <readline/readline.h>
 #include <readline/history.h>
-#endif
-#include <mruby/string.h>
 
-
-#ifdef ENABLE_READLINE
 static const char *history_file_name = ".mirb_history";
 char history_path[PATH_MAX];
 #endif
diff --git a/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c b/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
index ef0ac4978..54b2f8b65 100644
--- a/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
+++ b/mrbgems/mruby-bin-mruby/tools/mruby/mruby.c
@@ -1,13 +1,11 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include "mruby.h"
-#include "mruby/proc.h"
 #include "mruby/array.h"
-#include "mruby/string.h"
 #include "mruby/compile.h"
 #include "mruby/dump.h"
 #include "mruby/variable.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
 
 #ifndef ENABLE_STDIO
 static void
diff --git a/mrbgems/mruby-hash-ext/src/hash-ext.c b/mrbgems/mruby-hash-ext/src/hash-ext.c
index 94518924e..c6e72f451 100644
--- a/mrbgems/mruby-hash-ext/src/hash-ext.c
+++ b/mrbgems/mruby-hash-ext/src/hash-ext.c
@@ -6,11 +6,8 @@
 
 #include "mruby.h"
 #include "mruby/array.h"
-#include "mruby/class.h"
 #include "mruby/hash.h"
 #include "mruby/khash.h"
-#include "mruby/string.h"
-#include "mruby/variable.h"
 
 /*
  * call-seq:
diff --git a/mrbgems/mruby-numeric-ext/src/numeric_ext.c b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
index bb6955b45..22c1668fa 100644
--- a/mrbgems/mruby-numeric-ext/src/numeric_ext.c
+++ b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
@@ -1,6 +1,5 @@
 #include <limits.h>
 #include "mruby.h"
-#include "mruby/numeric.h"
 
 static mrb_value
 mrb_int_chr(mrb_state *mrb, mrb_value x)
diff --git a/mrbgems/mruby-random/src/mt19937ar.c b/mrbgems/mruby-random/src/mt19937ar.c
index 3246909e8..41ed2c00d 100644
--- a/mrbgems/mruby-random/src/mt19937ar.c
+++ b/mrbgems/mruby-random/src/mt19937ar.c
@@ -4,7 +4,6 @@
 ** See Copyright Notice in mruby.h
 */
 
-#include <stdio.h>
 #include "mt19937ar.h"
 
 /* Period parameters */  
diff --git a/mrbgems/mruby-string-ext/src/string.c b/mrbgems/mruby-string-ext/src/string.c
index 6718e734a..f194bbc0e 100644
--- a/mrbgems/mruby-string-ext/src/string.c
+++ b/mrbgems/mruby-string-ext/src/string.c
@@ -1,7 +1,7 @@
-#include "mruby.h"
-#include "mruby/string.h"
 #include <ctype.h>
 #include <string.h>
+#include "mruby.h"
+#include "mruby/string.h"
 
 static mrb_value
 mrb_str_getbyte(mrb_state *mrb, mrb_value str)
diff --git a/mrbgems/mruby-struct/src/struct.c b/mrbgems/mruby-struct/src/struct.c
index 309684422..e6d3b0796 100644
--- a/mrbgems/mruby-struct/src/struct.c
+++ b/mrbgems/mruby-struct/src/struct.c
@@ -10,7 +10,6 @@
 #include "mruby/array.h"
 #include "mruby/string.h"
 #include "mruby/class.h"
-#include "mruby/data.h"
 #include "mruby/variable.h"
 
 #define RSTRUCT_ARY(st) mrb_ary_ptr(st)