* include/dhcpcsvc.h: New file.

Note that MSDN is confused about whether it should start constant
	and structure names with DHCPCAPI or DHCPAPI. It's using both but
	experience suggests it's DHCPCAPI with `C'.

	* lib/dhcpcsvc.def: New file.

winsup/w32api/lib/test.c

@@ -80,6 +80,7 @@
 #include <vfw.h>
 #include <uxtheme.h>
 #include <tmschema.h>
+#include <dhcpcsdk.h>
 
 #ifndef __OBJC__  /* problems with BOOL */
 #include <ole2.h>