File bash-4.3-include-unistd.dif of Package bash43

This change was originally part of patch bash-4.3-loadables.dif.
However the loadables build just fine with this change, so it may
still be needed but does not belong to that patch.

--- shell.h.orig
+++ shell.h
@@ -22,6 +22,9 @@
 #include "config.h"
 #endif
 
+#include <sys/types.h>
+#include <unistd.h>
+
 #include "bashjmp.h"
 
 #include "command.h"