rework syncqt interaction regarding cross-tree paths

instead of relying on more or less accidental qmake behaviors regarding
the base dir for relative paths (esp. if a file does not exist yet),
make everything explicit. to that effect, clearly define the base tree
(source or build) for every syncqt-generated variable, and write only
in-tree relative paths to the variables. on the receiving end, resolve
the paths as soon as headers.pri was read.

Task-number: QTBUG-67111
Change-Id: I32ae5760fb62ebc650fdb69e46aac786a8141564
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

0 files changed, 0 insertions, 0 deletions