* signal.c: need to include unistd.h for write(2).

unistd.h is now included via ruby/defines.h, but should implicitly
  include here.  (suggested by kosaki)


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40743 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Wed May 15 00:42:54 2013  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* signal.c: need to include unistd.h for write(2).
+	  unistd.h is now included via ruby/defines.h, but should implicitly
+	  include here.  (suggested by kosaki)
+
 Tue May 14 23:43:05 2013  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/.document: Add ifaddr.c.

signal.c

@@ -19,6 +19,9 @@
 #include "ruby_atomic.h"
 #include "eval_intern.h"
 #include "internal.h"
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 
 #if defined(__native_client__) && defined(NACL_NEWLIB)
 # include "nacl/signal.h"