Some update packages use both lowercase and uppercase names for
expressions.

For example, Microsoft-Windows-MediaFeaturePack-OOB-Package_x64.msu
uses both Runtime and runtime for expressions.
Signed-off-by: Mohamad Al-Jaf <mohamadaljaf@gmail.com>
Signed-off-by: Hans Leidekker <hans@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>