* winsup.h: Split out dtable definitions into separate header file.

* dtable.h: New file.
* sigproc.h: Eliminate pinfo.h usage here.  Use it in source files that need
it.

winsup/cygwin/strace.cc

@@ -14,6 +14,7 @@ details. */
 #include <wingdi.h>
 #include <winuser.h>
 #include <ctype.h>
+#include "pinfo.h"
 
 #define PROTECT(x) x[sizeof(x)-1] = 0
 #define CHECK(x) if (x[sizeof(x)-1] != 0) { small_printf("array bound exceeded %d\n", __LINE__); ExitProcess(1); }