cmake: absolutely mistic bug fix.
cmake: absolutely mistic bug fix.

when using string_configure() you could end up with

set(WORLD /path/to/world/inc)

instead of

set(WORLD_INCLUDE_DIRS /path/to/world/inc)

aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild