Expand qmake values when dealing with source file names, include
directories and more. This handles cases where variables are used
to refer to sources (e.g. $$VERSIONTAGGING_SOURCES in corelib) as
well as things like $$QT_SOURCE_TREE and friends.
Note that $$PWD and $$OUT_PWD are still need hand-holding since they
refer to the scopes directory relative to the top level directory --
which pro2cmake.py does not know.
Change-Id: I011ef55416ff820053d5f844b3008836849f5075
Reviewed-by: Albert Astals Cid <albert.astals.cid@kdab.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@qt.io>
35a30c7ebb