* fcl-db/dbase: cosmetic

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24343 3ad0048d-3df7-0310-abae-a5850022a9f2
* fcl-db/dbase
  Try to deal with case-insensitive filesystems:
  let index and memo file extensions follow case
  of existing filename.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24344 3ad0048d-3df7-0310-abae-a5850022a9f2