+ Require -d and -u command line options to have an argument, Mantis #25082.
+ Check that argument of -d and -u is a Pascal identifier, Mantis #17056.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26755 3ad0048d-3df7-0310-abae-a5850022a9f2