Fix casing error

git-svn-id: http://svn.eu.adacore.com/anonsvn/Dev/trunk/GtkAda@231406 936e1b1b-40f2-da11-902a-00137254ae57
Make it easier to test with No_Streams restriction

(see N811-011)

git-svn-id: http://svn.eu.adacore.com/anonsvn/Dev/trunk/GtkAda@231407 936e1b1b-40f2-da11-902a-00137254ae57