Backport change from 1.2.1: src/avenprcore.h: Declare border as "struct border" rather than as a typedef to avoid a -Wshadow warning.
git-svn-id: file:///home/survex-svn/survex/branches/1.0@3673 4b37db11-9a0c-4f06-9ece-9ab7cdaee568