Fix a possible assertion when building the street index.

All cases where sorted names are compared with equals() need to be
changed to use Collator.compare() with the SrtCollator from Sort.

This patch fixes just a few cases to fix an observed assertion error.

git-svn-id: http://svn.mkgmap.org.uk/mkgmap/trunk@3093 25d90789-57f7-4ee0-8453-03a3dfeeeb22