[RFA] valops.c: delete unused VALUE_SUBSTRING_START

[David Taylor]

    From: Nicholas Duffek <nsd@redhat.com>
    Date: Wed, 3 Jan 2001 15:42:23 -0500

    While looking through valops.c, I encountered an undocumented macro
    VALUE_SUBSTRING_START that isn't used anywhere.

    ChangeLog:

	    * valops.c (VALUE_SUBSTRING_START): Delete.

    Tested on i686-pc-linux-gnu.  Okay to apply?

Approved.