Collect module_sync_headers targets from the target deps

Use the internal target property to store the module_sync_header target
name. The property then is used to collect module_sync_header targets
and build the dependency tree between them. This mechanism only works
for Qt dependencies that are added using qt_internal_extend_target call
that works well at least for out CI builds. The mechanism allows to
omit the race in sync_header runs that might lead to unexpected results
since internal targets like automoc or headersclean_check only depend
directly on module_sync_header target that belong to the module.

Change-Id: I564f3ea0f3c1703e70c4c300fd1307c3214d39d8
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

0 files changed, 0 insertions, 0 deletions