* winsup.h: Eliminate inclusion of most of the cygwin .h files. Use .h files

only in sources which require them.
* Makefile.in: Generate dependencies with -MD option.

winsup/cygwin/fhandler_zero.cc

@@ -12,6 +12,7 @@ details. */
 
 #include "winsup.h"
 #include <errno.h>
+#include "fhandler.h"
 
 fhandler_dev_zero::fhandler_dev_zero (const char *name)
   : fhandler_base (FH_ZERO, name)