Some files used CR-LF; normalize to plain LF. Test resources left
untouched.

Change-Id: I54c38714c50dc3ca35c78b14f5a66fdbcf2df6ef
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>
Reviewed-on: https://git.eclipse.org/r/c/jdt/eclipse.jdt.core/+/187193
Tested-by: JDT Bot <jdt-bot@eclipse.org>
Reviewed-by: Andrey Loskutov <loskutov@gmx.de>