For source packages that don't have a .git subdirectory, syncqt is
executed before configure, with outdir set to srcdir, and this
caused path misalignments for injected headers in qt_module.prf
when generating makefile rules.
The fix is to change syncqt to always output injected header
paths relative to the source dir.
Task-number: QTBUG-64539
Change-Id: Ia2296e44494093dbf124729062f430ad6fca7262
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
0dc025bf9f