The following fixes problems introduced by changes to schedlock.c which 
watchthreads.exp also uses.  It switches to use gdb_get_line_number so that the 
file can change freely without affecting the watchthreads.exp test case.

Ok to commit?

-- Jeff J.

2004-09-28  Jeff Johnston  <jjohnstn@redhat.com>

         * gdb.threads/schedlock.c: Add comment markers to use to find
         line numbers.
         * gdb.threads/schedlock.exp: Adjust regex to handle the new
         comments.
         * gdb.threads/watchthreads.exp: Use gdb_get_line_number to find
         breakpoint lines.