Build fix for Solaris

refs #6821

Signed-off-by: Gunnar Beutner <gunnar.beutner@netways.de>
Fix incorrect usage of readdir_r

refs #6821

Signed-off-by: Gunnar Beutner <gunnar.beutner@netways.de>
Update AUTHORS

refs #6821
Merge branch 'fix/solaris-6821'

fixes #6821