Also disallow ~ in installpath.
Also disallow ~ in installpath.

Task-number: QTIFW-304

Change-Id: I4fa0b00165e43143cc8c5993c0aba07e9d793f76
Reviewed-by: Tim Jenssen <6a21f175c697b4129e1bafb6e9b52078bb1a6738@digia.com>

olear/qtifw,olear/qtifw,olear/qtifw,olear/qtifw