remove st.h inclusion

src/parse.y

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

src/re.h

@@ -13,6 +13,7 @@
 #include "node.h"
 #include "regex.h"
 #include "encoding.h"
+#include "st.h"
 
 #define BEG(no) regs->beg[no]
 #define END(no) regs->end[no]

src/string.c

@@ -19,7 +19,6 @@
 #include "re.h"
 #ifdef ENABLE_REGEXP
 #include "regex.h"
-#include "st.h"
 #endif //ENABLE_REGEXP
 
 const char mrb_digitmap[] = "0123456789abcdefghijklmnopqrstuvwxyz";

src/variable.c

@@ -16,7 +16,6 @@
 
 #ifdef ENABLE_REGEXP
 #include "re.h"
-#include "st.h"
 #endif
 
 static void