Handle up to 63 partitions per drive

Revamp device parsing code.  Introducing support for more partitions
into the shilka-generated parser has the unfortunate side-effect of
raising the size of the DLL by almost 2 Megs.  Therefore we split out
the handling for /dev/sdXY devices into a tiny bit of hand-written
code.

While at it, remove some unused cruft from devices.* and generally
clean up the device class to provide access methods instead of direct
access to members.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/fhandler.cc

@@ -159,8 +159,8 @@ char *fhandler_base::get_proc_fd_name (char *buf)
 {
   if (get_name ())
     return strcpy (buf, get_name ());
-  if (dev ().name)
-    return strcpy (buf, dev ().name);
+  if (dev ().name ())
+    return strcpy (buf, dev ().name ());
   return strcpy (buf, "");
 }