Include directories can be lists, shouldn't be quoted

The include directories variables can be lists (as is the case here),
and should not be quoted so that CMake expands them out correctly.

Change-Id: Ic98d96533feab986eb3bd39fd7cf8b928ad3328d
Merge topic 'fix-includes-molequeue' into master

2fa2e190 Include directories can be lists, shouldn't be quoted